9mm AR "Gentle Recoil System" - No More Snappy Recoil! AR9
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- Опубліковано 20 сер 2023
- This is the Gentle Recoil System I came up with after experimenting and studying the 9mm AR simple blowback system, and it works surprisingly well!
*NOTE: As of May 2024, Wilson Combat changed their springs and they no longer fit on the wide-body Kynshot buffers used in the Gentle Recoil System.
*NOT for CMMG Banshee! Simple blowback 9mm AR ONLY!*
More information including links can be found at Blowback9.com.
I wear ear plugs, or muffs, or both, in every shooting video.
Disclaimer:
Blowback9's videos are filmed at a private shooting club in a controlled setting under the supervision of trained professionals. Blowback9's videos are for entertainment purposes only. Do not try to recreate or mimic anything seen in Blowback9's videos. Do not act in any way based upon any of the information found in Blowback9's videos. The accuracy of the information in Blowback9's videos is not guaranteed or warranted in any way. You, and only you, are responsible for the consequences of your actions. By watching Blowback9's videos you agree that we will not be held liable for any injury to yourself, others, or property resulting from attempting anything based on what is shown or described in these videos.
I wanna see you succeed my man.
Thank you! I had to step away for a bit and missed this, but I'm back! Lots of new content coming soon.
This man’s research and development of a soft shooting 9mm AR setup is greatly underestimated. Bravo sir. I’m here because of your Reddit fame! ✌🏼
This man is a legend .. it’s like seeing a real artist release a song, after seeing a watered down genre of music . This is gun enthusiasm. trial and error and the perfection of a craft . Passing knowledge.
FYI per Kynshot if you use a A5 length buffer tube (8" OAL / 7.75" internal depth) you should pair the Kynshot buffer with ONE spacer. If you get the buffer tube mentioned in this video that is 8.5 OAL which is why he mentions 2 spacers.
A5 Tube = Kynshot 5007, 1 Kynshot spacer, Flat Carbine spring.
I honestly can say that without this guidance my ar9 would be in a dumpster. It now runs almost perfectly with much of the "snappiness" gone. Thanks, Blowback9!
Glad I could help!
Wow…. I built an ar9 over the winter. I was shocked at the amount of recoil. My fingers actually went numb from shooting it. I found this guy and ordered the goodies he mentioned in the video and is page. Well worth the money. Almost no felt recoil now. Follow up shots are easy. If you are on the fence… do it. I know it’s not cheap… but it’s worth it.
My Wife cheered in agreement @7:20 when you said: "...you need that extra inch and a half."!!!
LOL!
A sincere thank you for making these videos
I cannot thank you enough!!! What a difference with your gentle recoil system. It went from so unpleasant to shoot to an absolute joy. Thank you
Found your blog a couple years ago. I love what you're doing, such a great resource. Thank you for shaeing.
Draco 9s with brace is a flat shooter and repeat shot low recoil carbine. Its amazing.
That being said my shorty ar9 is spot on for a single shot, but jumps around like crazy if I do double taps or fast shooting
When you buy a flat wire recoil spring they should automatically include one of those KAK recoil spring installation widgets with the spring!🙂
True! KAK does, and they also have a free .stl file for 3D printing you can download.
Your website gave me all the info I needed for my AR9, been shooting it for a couple years now! Thanks!!
Great to hear - thanks!
Excellent info, thank you!
Just subscribed after watching one video. Great, practical, "regular guy" tone but far more than regular insight and info. Gotta go binge your playlist, into the rabbit hole I go.
Awesome, thank you!
Thank you for the very much for the simple video and link to your research. I will be trying out the hydraulic buffer and Tubb flat wire spring in my Colt 9mm.
After trying it out, i might continue and get the longer tube and spacer weights to complete the gentle system
Let me know how it goes!
I never felt my AR9 recoil was bad but I have an Odinworks adjustable weight PCC buffer with all the tungsten (I think around 9oz), a Law Tactical folder and a Toolcraft BCG with the weight insert shortened to fit the carrier plug from the folder. It's as much carrier/buffer weight as I could get without adding weight outside the buffer.
It fits in a standard carbine buffer tube with a standard spring (not flat wire).
After I put it together I noticed people complaining about AR9 recoil but I wondered what they were talking about.
Also I used a modified carbine stock stopper from Strike Industries to limit my adjustment range. At the shortest it stops before the buffer tube pokes out of the back and at the longest it is less than the ATF's old limit for pistol brace LOP before they decided to ban pistol braces. Luckily they have been injoined from enforcing their new rule on me because I'm a member of a group suing them who recieved an injunction before the rule went in to effect and I'm covered by that and the nationwide injunction now.
I don't have a hydraulic buffer but i don't think I need one, it's very soft shooting and controllable with a 7" barrel and plain muzzle.
It's not terribly heavy but the mass of the gun probably helps. It has the brace, the folder adds some weight, it has a Trijicon MRO and a pistol length Mlok rail with a UTG AFG. That's not too heavy and the rest is pretty standard stuff, nothing excessively heavy or specifically light weight. It's still quite heavy compared to a Glock 17.
I broke it in doing the PCC class of a competition. Bottom line, it just ran and it was really easy to shoot fast and accurately (compared to how slow I normally shoot). I typically shoot CCI Blazer Brass at the range because it seems pretty consistent and the brass case treats the action better than steel. I don't know what it would feel like with +p or +p+ type ammo but the 7" barrel pretty much maximizes muzzle velocity so standard ammo is probably moving as fast as +p ammo shot from a 4" barrel.
Love it! Building my ar9 currently
This guys knows his shit... Just subscribed... Thanks for all of your research and testing...🇺🇸
I just put a AT3 Muzzle brake on my build . Helped a lot so far i did one mag test at 100 grabbed a 1.5 group thats shootinthrough trees ..
I might give that a try thanks.
5 star video
As you know I did a vid on it, and I am loving it. I might try out a flatwire spring to see if you're right about noticing the noise subconsciously. Thanks again for your work, you are doing a great service for the gun community.
If you try a flatwire, let me know what you think! I won't go back to roundwires now.
I'm going to give this a try and come back with results.
Thank you for the research and development. You have 100% earned my subscription!
Awesome! Thank you!
Thank you for sharing all your research. Being from NJ I will have a 16" barrel on my 9mm AR. Im definitely going to buy this buffer system but do you have a recommendation on BCG?
Great videos BTW. The info and effort is excellent, and appreciated.
Yes! I've always takes umbrage with the springy twang of the M16. I liken it to an old screen door with a simple spring closing mechanism. Anyone that I ever described it to - even having just fired a round - they tend to not know what I am talking about. I find it very distracting. And it makes me feel like the rifle is lower quality than it should feel. Like a toy that could kill you. And that's a bad feeling to have.
Did you do any testing with the kynshot RB5020SS HYDRAULIC 9mm Buffer?
I just received all the components you recommended and I’m excited to try it in a foxtrot mike’s that wld rattle, your fillings loose with recoil
I think you'll be happy with it!
Have you tried the buffer/bcg combo from JP Enterprises?
By chance would all the info on your channel apply to the Freedom Ordnance FX-9? I know the specs on the lower/upper are a bit different than an AR9
All the details: blowback9.wordpress.com/2023/05/28/9mm-ar-gentle-recoil-buffer-system-final/
Man your videos and research are second to none! I truly appreciate your videos and shared knowledge!!! That said, I have a question, Will the kynshot competition short stroke 7.7 oz buffer work the same in an 8” A5 buffer tube without the added spacer weights? I’m building an aero epc9 with the b. King 9mm bolt.
I haven't played with their competition buffer yet, but as long as the bolt travel distance is right, it should work. I check for proper travel distance by making sure the bolt face stops about 1/8" to 1/4" behind the bolt catch when the CH is pulled all the way back (and the piston is compressed).
Just an update, the competition short stroke ran flawlessly in the 8” A5 tube. Bout 200 rounds through it and no malfunctions or failures to feed with 27rnd pmags. Feels smooth as butter!
WOW, thank you this is the most impressive recoil reduction system yet! It makes my Foxtrot Mike 9mm shoot like a totally different gun and shoots way smother & flatter that before!👍
Glad to hear it!
Verified it works perfectly! Quick question I hope, are there any other pistol tubes that might work, instead of a carbine tube?
Unfortunately I don't know of any pistol tubes that are 8.5" internally, but there is a configuration that will fit in a normal carbine/pistol tube and provide most of the recoil benefit: blowback9.wordpress.com/2023/05/28/9mm-ar-gentle-recoil-buffer-system-final/
I’m curious what the shortest pull length is with the 8.5” buffer tube and how many adjustment holes in the Just Right 8.5” buffer tube.
im super hype to try it out and compare it to my maxim roller delay system when i finally get that delivered
How’d it do?
@@jacobcarter6028 um, it’s over a month late but I emailed support and a guy called my cell phone and said he’d throw in a t shirt whenever it gets shipped
Lame af lol. Gonna ask for a discount on a 10mm dissent
How was it?
How'd it go?
I have the Maxim RDB and its awesome but man it is hard to overcome the ball bearings, I haven't had it long and only have 570 rounds through it and its gotten easier but still shockingly difficult.
I recently bought the Palmetto State Armory PX9 Gen-4 rifle. WOW the amount of crud that is blown into the receiver and out the ejection port!
My brother is left handed and can even see the amount of powder residue being blasted on his face! The brass casings are even ridiculously covered with crud and quickly turned the costly walnut media in my tumbler into looking like I am tumbling with charcoal.
I' m now seeing these exact same complaint from even years ago, and so it's pathetic that any company would still be letting their guns leave the factory with their schitty light weight buffer. Theyre charging an average of 800.00 for the gun and yet theyre then making us pay for the PROPER 8oz buffer which significantly helps keep the bolt closed longer in order to keep most of the crud in the chamber and it reduces the recoil
Amazing research!!! Have you been able to test if the use of a suppressor changes reliability?
Thanks! Runs great with a suppressor.
How would this compare to the Maxim Defense roller delay buffer? Also, what length spacer would you need in the rear for an A1/A2 buffer tube? My current setup is a 16" Foxtrot Mike FM9 with a Doublestar ACE ARFX 10" fixed stock, and i used a spacer from MidwayUSA to make it carbine length internally for the Maxim RDB. I also had to remove 0.084" (iirc) from the spacer for the RDB to fit properly. I currently have 570rds through it with 0 malfunctions (all S&B 115gr fmj) and recoil isnt bad at all. The thing that i don't like about the RDB however is how hard it is to overcome the ball bearings when pulling the charging handle back. After 570 rounds it has gotten noticeably easier, but is still pretty difficult, and I'm a pretty stout guy. Everyone ive showed it to thought it was seized until i said jerk hard and they got it. Im thinking of building another but regular blowback (i went with the RDB for weight savings). Oh also i removed the added weight from the bolt for clearance with the RDB. Any ideas? Thanks!
Thank you for all your hard work and input, now im on waiting game! 😅
Follow this guys advice!!!!
Thanks for all the good information 👍🏼
You bet!
Fantastic video, I wish I had seen this sooner! Is the Spikes 9mm bolt good for an EPC9 upper build, or should one use one of the bolts on your website?
That bolt should be fine.
Would you recommend this setup for a 5.5” barrel with a 4 inch suppressor and a law tactical folder?
I know you mentioned getting as much weight as possible with suppressors and wanted to confirm with you. Thank you!
Sounds a lot like one of my setups. It should work fine. If you use the "original" gentle recoil setup, it'll be 11oz in the buffer tube.
Hey so which setup would you recommend for a competition PCC with 10-12 inch barrel length? I want to go with as fast double taps as possible, preferably with lowest possible recoil.
I don't do competitions, but my understanding is that the lighter setups are better for reducing dot jiggle even though they produce greater felt recoil. I'd try the lightest buffer setup that's appropriate for the bolt's mass (bolt+buffer total around 22oz.)
First off thanks for sharing all of your information and thoughts about AR-9 mechanics/physics. Question for the blow back recoil system improvement on this platform: would inserting a 24mm - 25mm diameter 5mm - 10mm thick rubber washer/gasket pad with a hole in the center the same size as the end of the buffer tube at the rear help reducing felt recoil? what are your thoughts seems to me that could help reduce/absorb some felt recoil but I'm not sure how negligible the improvement might be.
Sounds like the Tacticool buffer for the Sub-2000 - check it out. It should have an effect on the felt impact of the buffer. The hydraulic buffer piston essentially serves the same purpose in the gentle recoil system.
I read in your docs that you used the Kynshot R5000HP hydraulic buffer with a 3.25" length. Why did you use that with the JRC long buffer tube and not the Kynshot RB5015HD with a 3.9 length? Kynshot says that one is designed for PCC's. I've never used any kind of hydraulic buffer, Kynshot, or anything else. I might try this so I'm curious as to why you went the way you did.
On my site there are additional configurations for "gentle" recoil, and each group of parts - tube, weights, and buffer - is very specific and can't be mixed/matched. Together they give the right travel and spacing for the 9mm bolt in the receiver, otherwise damage could occur. The 4" is considered "PCC" because it's too heavy for 5.56 and the length is correct for the generic typical configuration of a 9mm bolt with a carbine tube. The 5000HP measured as about the same piston compressive force as the 5015HD, it's just a little shorter and lighter. Adding a spacer weight in front gives it 4" total (PCC length) and is slightly heavier than the 5015HD, giving a slight mass advantage. Hope that helps!
What kind of bolt do you recommend running with this setup? Was thinking FM9 just wanted to hear your thoughts...I know some bolts are missing a lug or something that can cause case blowout so ofc id want to avoid that. Thanks!
Here's a list of my preferred bolts. All have the same exact design, but may have different internals. I own the BKF, KVP, and Brownells. All run great. blowback9.wordpress.com/2021/04/06/a-9mm-ar-build-parts-list/#bolts
Hi, I went to Botach website and the description for the 9mm buffer (RB5015HD) says it’s for use in 8” barrels or greater. I’m running a 7” barrel. Have you tested this system with barrels shorter than 8”? Thanks.
Yes! It works fine in my shorter barrels.
@blowback9 Have you tested the CMMG delayed recoil system combined with your gentle recoil system? Really interested to hear what you think of the combination
CMMG uses their system in the Resolute 9mm model and full buffer tube.
The two aren't compatible with each other because of the weight, but it's reported that a plain hydraulic buffer will work with the CMMG RDB system.
Ever used the kaw valley pcc spring? I have one with a vltor stainless buffer, haven't used since I still need a handguard for it, just curious if you've tried a similar combo yet
No. XP springs are not necessary or beneficial for 9mm. They can cause a bunch of problems, instead. More here if interested: blowback9.wordpress.com/2021/04/07/the-case-against-308-rifle-recoil-springs-in-a-9mm-ar/
@@Blowback9 I did not realize that it's just a 308 spring, sob. Well the lower that I plan on using has a strike flat wire so I'll just swap the buffers when I need to and keep the other spring for whenever I get around to an ar10 build
Hey I’m getting ready to build my first build soon, do you think the gentle recoil system will work the same on a 8 inch taccom barrel, with taccom bcg ?
I haven't tried that specific setup, but it should work just fine.
Would the Veltor A5 buffer tube with A5H4 6.8 oz buffer work if keen shot got to cold in the winter?
Yes, but it wouldn't cushion the buffer's impact in the back of the tube. A KAK K-Spec may be a better option with the spring dampened head.
Will this setup work on a typical AR15? Im trying to make a flat shooting laser pointer. Do I need to purchase the 8.5 inch long buffer tube plus the correct hydraulic buffer plus the kynshot spacer weights if I wanted to run the same recoil dampening benefits on an ar15?
This will not work with a normal AR-15 because it's gas-operated, not simple blowback. It has to be balanced in different ways.
If I have a std length, mil spec buffer tube could I get away with 1 spacer weight? OR would you recommend just running a gold top with flat spring?
I would use an RB5000HP buffer and 1 spacer weight with a carbine tube to get some improvement over a standard buffer setup. For a larger improvement, I'd swap to an A5 tube and use 2 spacer weights (with the same buffer).
My fx9 has juat as much of a punch then 556, with a BFSlll trigger its wild! But runs flawless. Doing this will it cause any issues?
I would not add this to a BFSIII. The BFSIII relies on a fast & light action to avoid hammer follow. The GRS slows the action down to reduce felt recoil. My BFSIII setup uses 22oz total mass, 4" deadblow buffer with a Sprinco Blue. I haven't outrun the trigger yet.
Is there a buffer tube "recoil buffer" similar to the ones that Mcarbo, Missouri tactical, and tacticool products offers for the Sub 2000? I think extar uses a somewhat similar "system" in thier buffer tube as well. Do you think this would reduce ar9 perceived recoil?
You mean a neoprene-type squishy thing? Not that I know of, but that was my inspiration for using a hydraulic buffer. I had a tacticool buffer long ago in a keltec sub-9 (pre-sub2000).
@@Blowback9 yes. Thats interesting. I might try to modify a sub2k recoil buffer or try to make something similar. I think it helps in the sub2k
What combination do you recommend for an AR-40 with a carbine length tube?
I don't have .40's, so I'm not sure of the best setup, but I'd go as heavy as I could.
Extended buffer tube used only with this particular setup and not the other ar9 buyers correct?
The tube length is critical for getting the correct bolt travel with all the additional spacers. Check here for the tube/parts combos that work: blowback9.wordpress.com/2023/05/28/9mm-ar-gentle-recoil-buffer-system-final/
Is the 5015hd the same length as the 5007? I went to order the 5000hd but out of stock so got the 5007 pairing with the 8.5 tube and 2 spacer weights. Will this configuration work for a 16" barrell?
The 5015 and 5007 are the same length. The 5000HD is 3/4" shorter. That configuration should work with a 16" barrel.
I saw this video after I purchased the Kynshot plus Springco Orange spring, so that's what I am going with to start. Did not realize the HD version has DOUBLE the resistance. I am not sure if that's good or bad. That sounds like a lot with the two weights. One thing about a 16" barrel; I started with a pistol build and went to a full stock 16". I think the added weight eclipses any additional felt recoil. Also, a 16" barrel 9mm is rather quiet. If this does not work out I actually have a Just Right buffer sitting around and an extra M4 spring, so I could try with the two spacers. Oh - about Botach. Yes they are less. I ordered from them, they sent me a shipping notice, then, they cancelled the shipping notice and said it would be three weeks on back-order!! So I ended up getting the standard Kynshot from Brownells. Will post more info when I get to the range and try it out.
If you swap that orange for a normal carbine (or better yet, a flatwire carbine to get rid of the spring noise) spring you'll likely notice a big difference in how it feels and functions. Have fun, be safe!
@@Blowback9 Thanks for all of the info.
@@Blowback9 Ahh! I took the time to read your analysis of the 308 spring (and presumably Orange springs, etc). Great write up. [EDIT] Oops - meant to put this reply where you reference 308 spring write-up.
No worries! Yes, "Orange" is what Sprinco calls their .308 carbine spring. @@calicojack556
How does this compare to the scheel roller delayed buffer? Or to the combo that max Leograndis used to use? (Rb5020ss, springco orange, a5 tube, short stroking spacers)
Softer and slower than the scheel. The scheel can tuned for better dot movement but this is much better across more ammo types.
The max combo is great for soft reloads but has more felt recoil and is snappier/ faster for sure.
@@ZChaosFactor thanks. I just ordered the maxim rdb. Eager to try it out.
How does the MPX stack up to the Gentle Recoil System and MP5?
MPX is better but not as reliable and more expensive.
Last question, how long is the Flat Wire Buffer spring when it is out the tube and laying on the bench?
Depends on the spring. I have 15 different kinds. Around 11"-15". Measurements: blowback9.wordpress.com/2023/03/03/flat-wire-spring-comparison/
Theoretically, could one use the KynShot shorty .308 hydraulic buffer RB5004 (2.5" long and 3.8oz), with 2 of the 2.5oz, .75" long spacers, in a standard length carbine tube, totalling 8.8oz in the tube? Weight would be down by 2.2oz under your setup in this video @ 11oz but you keep the shorter tube. I suppose one would have to experiment in their combo. I run an 8oz buffer in my 16" home build, and feel it is not under weighted, atleast not severely anyway, and that is just a standard buffer without the hydraulic dampening effect.
I digress, I am running the 11oz AR Stoner extended (blue) buffer in my home build. It is 4" long exactly. Damn, the extended buffer tube looks to be the way to go.
I tried that exact setup. The 5004 has a shorter piston and just didn't do as good of a job, but it's an option!
what setup should I use on a foxtrot mike 9 suppressed?
I would use the original Gentle Recoil System, but that's your call.
What setup do you recommend with a SBPDW or Maxim defense?
I'd recommend using the factory supplied PCC spring/buffer setup with those shorter proprietary tubes.
Do answer these comments? Got receiver milled good ,got your suggested 11oz weight and flat spring. Do I really need 8.5 buffer tube???
I try to. You don't need an 8.5" tube unless you're trying to make the Gentle Recoil System. A regular carbine tube, 11oz. buffer and flat carbine spring will work just fine.
So - now that this matter has been settled - what about 45ACP? ;)
Is that jrc tube an a5 length? Or is it proprietary?
It's longer. Carbine tube = 7", A5 tube = 7.75", JRC = 8.5" .
I have a 16.2oz bolt with the same Kynshot 5015HD buffer (total 22.3oz). It is on an Aero EPC-9 with 16” barrel. I changed to a Tubbs Lightweight flat spring after reading your blogs. Would you still recommend adding both 2.5oz weights or just a single weight?
If you're over 22oz, you should be fine. More mass will reduce felt recoil, but you would need a longer buffer tube due to the added length of the spacer weight(s). Check the article on my site for different tube/buffer/weight combinations.
Thanks for the feedback. I copied your setup and installed the Just Right tube and two weights. I'll be playing around with it this weekend to dial it in.@@Blowback9
How would you compare this to a roller delayed buffer ?
Similar feel. The roller delay Maxim is much harder to charge, though.
This may have already been addressed, but is there an additional benefit from combining this system with the CMMG bolt/barrel?
No. It's too heavy for the radial delay. Some folks do use hydrauilc buffers with the CMMG, I'm just not sure of the setup. Try c3junkie.com.
Since wilson combat changed their spring dimensions do you recommend another maker for a flat wire buffer spring that fits over the kynshot?
Tubb carbine, Tubb lightweight, or AR Stoner fit. I'm working on others.
If it hasnt been said or questioned down in the comments and or if you have explored this type of setup. Your setup; weights, buffer and all, with a Geissele super 42 spring and a law tactical folder, your input/2 cents/ opinion? When i installed the law tact folder on my ar15, I needed a stronger spring, hence the geissele, to reliably feed. Looking forward to building a more serious PCC. Thanks, good stuff you got!
Thanks! I did an article on the Super 42. I wasn't impressed, but to each their own! Here: blowback9.wordpress.com/2023/05/02/geissele-super-42/
Have you tried the B&T AR-15 hydraulic buffer?
Not yet - I'll have to look into it!
I have exactly the same Hydraulic Buffer and long flat wire spring plus one of the 3/4” 2.5oz spacer weight in my S & W Response with the factory 7.25 or 7.3” buffer tube. Big improvement in felt recoil. I tried adding a second 3/4” 2.5 oz spacer weight but that didn’t allow enough room for the bolt to lock open. I’m wondering if I will be able to tell the difference if I install the 8.5” buffer tube with the 2nd 2.5oz spacer weight… Ummm
In my experience, adding the 2nd weight makes a noticable difference.
@@Blowback9 8.5” buffer tube and 2.5oz weight are on their way.
How does this system work for competition with shooting fast, double taps, etc.
Not great. Most serious competition shooters say it is a bit too "spongy" for timed competition games.
What did you find to be the optimal ammo grain weight to use?
I never specifically compared grain weight, but 147 seems to produce less rearward force. In my Overmass Project, 115 would cycle when 147 might not, so it appears the 147 was producing less blowback energy.
Reno May said hi
How would you retain the recoil characteristics of this system while incorporating a LAW tactical folding system? My initial thoughts are to weigh the LAW plug and just cut enough of the weight from the bolt needed for the plug to insert and then reinstall it, comparing the amount cut from the weight to the weight of the plug to see what the difference is. Has anyone does this while using this "Gentle recoil system"?
With most bolts, the cylindrical internal weight is 2.5oz. My Law plug is about 2.2oz., so the weight difference is minimal. The GRS works fine with my Law system build.
What are the pros/cons of the heavy 10 lb. hydraulic buffer vs. the standard 5 lb. hydraulic buffer?
I like the "feel" of the 10lb a little better, some folks like the 5lb better. Either one should work fine. Get whichever is cheaper!
@@Blowback9Thanks, Doug. And you're right about Botach. The $130 buffer changes to $90 when you sign in!
Will just the hydrolic buffer by itself make follow up shots flatter?
Have you tried or heard from anyone who has tried using this system with a PSA AR-V? I didn't see any mention of it on your website, but I imagine it wouldn'thave any issue. I find the Scorpion/U9 mags to be the most aesthetically pleasing as well as being cheap, available, high capacity, and reliable to my knowledge, so it was high on my list for AR9 candidates.
Should work fine!
Oops. I had the weights in the tube first, then spring and finally buffer. It still worked but I moved the weights behind the buffer now. Does it made a difference?
It should be spring first, then buffer, then weights in the tube. The weights are between the buffer and the bolt. You should notice a big difference.
@@Blowback9 sounds good. It worked but I had it wrong. I changed it and I’ll test it soon. So far everything works well because of your guide . Thanks
Would this set-up accommodate a 16 inch OAL barrel?
It should. I use it with my 16".
Awesome video! I’m running a law tactical folder with their 2oz extension. Would you still recommend this setup in the video? Thank you
I haven't tested the full size GRS with my law folder, so I can't guarantee it, but I can't think of any reason why it wouldn't work.
testing it out tomorrow, thanks for posting all this. I looked but didn’t find any discussion on barrel length running this system, does barre length not really matter? I have a 8” for tomorrows range day but thinking about swapping to a 5”.
testing it out tomorrow, thanks for posting all this. I looked but didn’t find any discussion on barrel length running this system, does barre length not really matter? I have a 8” for tomorrows range day but thinking about swapping to a 5”.
@@dereks3016 With the GRS, it functions with any length barrel. Shorter barrels will have less felt recoil. That's the only difference.
Is 9mm 7.5inch less loud than 5.56? I like how 7.5 inch ar 15 looks with pdw stock
Absolutely, 9mm is usually designed to burn all of its powder in a 3-5in barrel.
@@nnerrfman6326 thanks!
man i wish i had seen this 6 months ago. Im now wayyy to deep "additively" building a mp5 with an ar lower.
however, matador makes an all-in-one upper that had my eye as well. v I wonder if they did anything to resolve the recoil or not.
I have one of their uppers and will be reviewing it soon.
I look forward to it!
Just another observation; there seems to be a lot of debate as to whether to go with more weight and a standard M4 spring or more spring tension (308 or similar) and less weight, or a balance of both.
Yes, there's a lot of debate, now that the myth that a .308 spring is somehow beneficial for 9mm has been challenged and shown to be without merit. No one has ever provided any empirical evidence that .308 springs are either necessary or beneficial. Instead, the've been connected to many significant problems with the platform that are resolved by switching back to regular strength springs. More info and analysis: blowback9.wordpress.com/2021/04/07/the-case-against-308-rifle-recoil-springs-in-a-9mm-ar/
@@Blowback9 Read it. Very compelling.
I'm going to build this, assuming all the parts are still available! Thank you!
If you sign up at Botach and log in, the price for the hydraulic buffer goes down a lot.
@@Blowback9 I'll say! Really appreciate you sharing your experience and knowledge. I'm staying tuned for sure.
@@Blowback9 I've got all my parts! 3 weights plus all the rest definitely added a nice bit of heft, I'm here to thank you again for being such a resource.
Reason being, I haven't had the chance to take it to the range, but manually operating the action has my ejector barely flopping them out but usually failing.
Saw the page on this issue and I'm going to be able to easily fix it because of you
@@Blowback9 So I'm unfortunately using an Aero EPC9 lower and the extractor can't really be bent, do you happen to know anything more about this lower?
I probably should have taken it out to the range before trying to troubleshoot ejection, it just doesn't eject if I manually operate things.
I’ve got a JP GMR15 with a Aero Precision buffer tube. It is 7.25” in length. I’m looking on your site at the recommendations and I’m not sure which to go with the Kynshot RB5000 or the RB5015HD. Ordering the Tubbs flat wire for it but I need help on which buffer to choose thanks.
I only ask because you have a 7” buffer tube listed or 7.75” option. Mine falls in between
I have an Aero Precision carbine buffer tube sitting beside me - it's 7" internal, the same as a standard carbine tube. Don't count the long "tongue" sticking out the bottom open end. Measure at the top.
Right on!! Thanks for the help!
Ordered the Kyn-Shot Rb5000hp and Kynshot spacer with the Tubbs flat wire from the link on your site. Can’t wait to test it out!!
I’m thinking about putting a Devil Dog Side charger on it too, have you used one of those?
I have not used the DD. Let me know how it goes! @@nylesreynolds2324
Would a rifle buffer work?
I woudn't. They're only about 5oz, which is too light for most 9mm setups. Plus they're much longer and require a A2 rifle buffer tube.
Hello sir! Love your content!!! I was wondering what kind of ammo do you usually shoot in your ar9 builds? And what is the best grain 9mm to shoot for reliability
I usually use 115gr Federal bulk or CCI Blazer Brass.
I had more breakage of parts on my lower with a 9mm blowback upper than I ever had with a 5.56 upper
That can happen, depending on spring and mass used.
Can you use an A5 buffer tube?
Yes, but it would need 1 less weight, unless you went with a shorter (5000HP) hydraulic buffer. See here for different tube lengths and the parts that fit: blowback9.wordpress.com/2023/05/28/9mm-ar-gentle-recoil-buffer-system-final/
@@Blowback9 thank you so much!!
I’m back with my results now that I’ve built a GRS in my 7” FM9 and tested it out. I went with:
1) VLTOR tube
2) Kynshot RB5000HP 4.8oz
3) 2 weights totaling 5oz
4) WC flat wire spring
Does it work? Absolutely. Is it worth $196? Not even close. But that’s okay. I enjoyed the process and it’s still 1 of my most favorite ARs to shoot. I still plan on making additional modifications. The stock FM bolt is 14oz. I’m going to upgrade to a 16oz eventually. I see Faxon has a 16oz bolt. Any recommendations on it or something different? Thanks again for all your testing. It’s a wealth of information.
Although it wasn’t worth the money to you, how was the overall performance of it your FM9 compared to stock? I recently got one and thinking about doing a similar recoil system in it.
It performs amazing. 2 weeks ago I got to shoot mine next to an identical stock version. It’s at least 15% softer. Half of that is due to the increased weight. I’m happy with the end results. If $ is no concern, I say go for it. If on a budget, I would focus on other things 1st.
@@scott2228 Great, thanks for the reply. I think I’m going to start with the kynshot buffer and a springco red carbine spring. I see another build that had that and it ran so smooth suppressed with just that.
On a separate note, I’m curious to if your FM9 had any problems with feeding using full 33rd Glock mags. My mags work fine as I’ve only had them at 60% while im breaking it in but I put a few extra in one of them and it jammed second shot. If they are full the first round jams after dropping the bolt, seems like there’s too much pressure in the mag. And a few occasions my trigger didn’t reset when I first took it to the range but seemed fine as I shot my last few mags towards the 200 round mark. Did you ever experience this same issue?
Sounds like a good starting point.
I never load past 30 rounds. Those last 3 rounds just seem silly to me. Every once in a while I’ll get a hang up on a full mag with the Kynshot. It’s never happened with regular buffer.
Speaking of regular…. I got great results using FM’s 45ACP bolt and the SprinCo Red.
@@scott2228yeah I wouldn’t load them to 33 either. I load mine to 30 and it seems to be an issue loading the first round.. granted I hadn’t got past the break in point so idk. Figured the mags maybe need to loosen up a little bit. Are you saying you had occasional issues with the trigger resetting when using the kynshot?
Can i use an A5 tube with 5015hd and 2pcs 2.5oz kynshot spacers?
It should work, but it will short-stroke the bolt and the bolt hold open won't work. A 5015HD + 1 spacer should provide the right travel distance in an A5 tube to allow the bolt hold open to function. It won't feel quite as good as 2 spacers, but will still be much better than a regular buffer setup.
I dont need the bold to hold open. Does short stroking have disadvantages?
I tried bcg (14.6oz) + 5015hd(6oz) + 2.5oz spacer weight. The muzzle dips during double taps causing my second shots to be low.
Does anyone know if this buffet set up would still benefit with a folding stock adapter? Id assume it would add some space and may at least reduce if not cancel out the benefit. Hope not as i really want both and that extra inch and a halfs gonna hurt 😂
It does work with a LAW folder. For a little shorter tube setup, an a5 tube, WC flatwire, RB5000HP buffer, and 2 kynshot weights provide good recoil feel. This is what I use on my LAW folder. This setup with the LAW is only about 3/4" longer, not 1.5".
@Blowback9 fantastic you are a wizard sir. Any luck with the Sylvan arms folder or unknown?
Unknown. I haven't played with the Sylvan, but it "should" be OK. @@dakotamoore32
I'm running a Foxtrot mike lower and an 8" PSA upper with a flat wire recoil spring and a Macon 7.5oz dead blow buffer. The recoil is fine.
I've run similar configurations. The GRS is significantly less snappy, but if you're happy with it, keep it as-is!