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Blowback9
Приєднався 11 тра 2007
Blowback9.com - the online encyclopedia of 9mm AR information. I am not sponsored by any company or individual. I don't sell anything, I don't have affiliate links, and I'm not doing this to make money. I do this for fun, and I have a very limited budget for all the work I do. My goal is to help people learn about the 9mm AR platform and what can make it run 100%, while dispelling persistent myths and misinformation.
MP5 v. Scheel v. Maxim v. GRS. How do they compare?
Comparing the roller delayed MP5 vs. roller delayed Scheel system for 9mm AR vs. Maxim drop-in bearing delay for 9mm AR vs. the Gentle Recoil System which has no mechanical delay at all. The Scheel was loaned to the channel by a viewer.
UA-cam Compliance: This video is not sponsored and does not contain paid promotions. All magazines in use hold under 30 rounds. All firearms are semi-auto only. All products shown are lawful to own. This video is an artistic production.
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.
UA-cam Compliance: This video is not sponsored and does not contain paid promotions. All magazines in use hold under 30 rounds. All firearms are semi-auto only. All products shown are lawful to own. This video is an artistic production.
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.
Переглядів: 889
Відео
Range Test 2: K-SPEC + Pur-Tungsten Pine Derby weights. Carbine sized 9mm AR Gentle Recoil System.
Переглядів 827День тому
This is experimental. Proof of concept. Do not try this! Range test of the K-SPEC 5.5oz. cushioned buffer with Pur-Tungsten 1" 3oz. Pine Derby Racer disk weights that I modified slightly for reliability. How does the K-Spec compare to the Kynshot RB5000HP? Continuing the quest to fit the 9mm AR Gentle Recoil System in a carbine buffer tube with the least amount of modifications. Using a flat wi...
Range Test: Pur-Tungsten Pine Derby weights experiment. Carbine sized 9mm AR Gentle Recoil System?
Переглядів 1 тис.14 днів тому
This is experimental. Proof of concept. Do not try this! Range test of the Pur-Tungsten 1" 3oz. Pine Derby Racer disk weights that I modified slightly for reliability. Continuing the quest to fit the 9mm AR Gentle Recoil System in a carbine buffer tube with the least amount of modifications. Using a flat wire spring, Kynshot RB5000HP hydraulic buffer, and two TUNGSTEN spacer weights made from P...
Better! Drop-in tungsten weights for carbine sized 9mm AR Gentle Recoil System
Переглядів 1,3 тис.14 днів тому
This is experimental. Proof of concept. Do not try this! These tungsten spacer weights are almost drop-in ready. Continuing the quest to fit the 9mm AR Gentle Recoil System in a carbine buffer tube with the least amount of modifications. Using a flat wire spring, Kynshot RB5000HP hydraulic buffer, and two TUNGSTEN spacer weights made from Pinewood Derby Racer Weights. They all fit in a carbine ...
Good results! KAK K-SPEC A5 Gentle Recoil System vs Original GRS. AR9/9mm AR
Переглядів 1,2 тис.14 днів тому
Wait, what?? A K-SPEC Gentle Recoil System? Comparing the 9.5oz. K-SPEC KAK Industries buffer 1 Kynshot spacer weight in A5 buffer tube to the original Gentle Recoil System Kynshot 5015HD 2 weights in JRC buffer tube. The K-SPEC setup costs about 25% less and did a great job of mitigating felt recoil. The Original GRS still feels a little better, but the difference may not be that noticeable. F...
Aero Precision EPC Receivers/Angstadt parts build: live fire testing
Переглядів 72521 день тому
Aero Precision EPC receiver set and Angstadt Arms parts build - it's time for live fire testing! Later in the video I did switch back to the JoeBobOutfitters ejector simply because the bend I put in the Aero ejector tip in the demonstration video wasn't necessary. I only did the bend for the video. It put too much pressure on the bolt, although it did eject very well! Before test firing the LRB...
AR9 Ejector Adjustment - Spikes Glock and R&D Precision Colt Mag Adapters
Переглядів 63121 день тому
Almost every ejection failure in an AR9 is the fault of the ejector position relative to the bolt. Most ejectors are now hardened and difficult to bend without breaking. In this video I show how I adjust the ejector using heat to prevent the ejector from snapping when bent. This video is not sponsored or monetized. Disclaimer: All videos on the Blowback9 channel are for entertainment purposes o...
Aero EPC Ejector Adjustment - Trim & Pivot, Heat & Bend methods
Переглядів 52328 днів тому
Almost every ejection failure in an AR9 is the fault of the ejector. The EPC ejector design is difficult to adjust, but it can be done by using the "Trim and Pivot" method for vertical adjustment and the "Heat and Bend" method for horizontal adjustment. I have not live-fire tested it yet. Range time is extremely limited this time of year due to weather considerations. This video is not sponsore...
Remove Aero Precision EPC-9 LRBHO Mechanism
Переглядів 617Місяць тому
How to remove the Aero Precision EPC-9 LRBHO mechanism. This video is not sponsored. I received no income or compensation for this video. Disclaimer: All videos on the Blowback9 channel are for entertainment purposes only. None of the videos are for intended for instructional purposes. Do not try to recreate or mimic anything seen in Blowback9's videos. Do not act in any way based upon any of t...
Aero EPC receivers/Angstadt Arms parts build progress - Good, Bad, and Ugly
Переглядів 1,1 тис.Місяць тому
YES, I'M USING A FACTORY GLOCK MAGAZINE. Progress on the Aero EPC/Angstadt Arms build 9mm AR build. What has happened so far. Still have some fixing to do and then it will be out to the range. After thinking about it, I decided to keep using the Aero buffer tube, just open up the channel to use the KAK tool. The magazine I used in the video is an unfired factory Glock 19 magazine. It would be c...
8) Miscellaneous/Obsolete/Addendums - Troubleshooting the Blowback 9mm AR
Переглядів 869Місяць тому
Video 8 - Miscellaneous/Obsolete/Addendums. Troubleshooting the Blowback 9mm AR. This is NOT comprehensive and does not cover every possibility. Troubleshooting Diagram: blowback9.wordpress.com/2021/10/22/9mm-ar-troubleshooting-guide-simple-blowback/ Disclaimer: All videos on the Blowback9 channel are for entertainment purposes only. None of the videos are for intended for instructional purpose...
7) Last Round Bolt Hold Open - Troubleshooting the Blowback 9mm AR
Переглядів 1,2 тис.Місяць тому
Video 7 - Last Round Bolt Hold Open problems. Troubleshooting the Blowback 9mm AR. Causes and resolutions. This is NOT comprehensive and does not cover every possibility. Troubleshooting Diagram: blowback9.wordpress.com/2021/10/22/9mm-ar-troubleshooting-guide-simple-blowback/ Disclaimer: All videos on the Blowback9 channel are for entertainment purposes only. None of the videos are for intended...
Aero EPC Ejector Adjustment - simplest method. FTE/ejection fix.
Переглядів 1,3 тис.Місяць тому
Almost every ejection failure in an AR9 is the fault of the ejector. The EPC ejector design is not conducive to adjustment, so can we replace it with one that is, and then adjust it? This is one POSSIBLE method for improving or fixing ejection issues in an EPC9. I have not live-fire tested it yet. I need to finish building the receivers and bring it to the range for testing. Disclaimer: All vid...
6) OOB Detonation, Burst, Bulged Cartridge - Troubleshooting the Blowback 9mm AR
Переглядів 866Місяць тому
Video 6 - Out of Battery Detonation, Burst, Bulged Cartridge. Troubleshooting the Blowback 9mm AR. Causes and resolutions. This is NOT comprehensive and does not cover every possibility. Mr GNG OOB Detonation (starts at 15 min, detonation at 17 min): ua-cam.com/video/ugqKsuNWQ94/v-deo.htmlfeature=shared&t=925 Troubleshooting Diagram: blowback9.wordpress.com/2021/10/22/9mm-ar-troubleshooting-gui...
Angstadt Arms 9mm AR Parts Unboxing/Impressions
Переглядів 977Місяць тому
Angstadt Arms sent a "care package" with a bunch of parts (and swag) for the channel to use for upcoming builds. I go over the parts, my impressions, and how they'll be used in my Aero EPC receiver set build that's coming soon! The products were sent with no obligations attached, and I am not affiliated with Angstadt Arms. Disclaimer: All videos on the Blowback9 channel are for entertainment pu...
5) Failure to Fire - Click, No Bang - Troubleshooting the Blowback 9mm AR
Переглядів 780Місяць тому
5) Failure to Fire - Click, No Bang - Troubleshooting the Blowback 9mm AR
4) Dead Trigger/Burst Fire - Troubleshooting the Blowback 9mm AR
Переглядів 1,3 тис.Місяць тому
4) Dead Trigger/Burst Fire - Troubleshooting the Blowback 9mm AR
3) Feed Failures - Troubleshooting the Blowback 9mm AR
Переглядів 1,1 тис.2 місяці тому
3) Feed Failures - Troubleshooting the Blowback 9mm AR
2) Ejection Failures - Troubleshooting the Blowback 9mm AR
Переглядів 1,4 тис.2 місяці тому
2) Ejection Failures - Troubleshooting the Blowback 9mm AR
1) Intro - Troubleshooting the Blowback 9mm AR
Переглядів 1,3 тис.2 місяці тому
1) Intro - Troubleshooting the Blowback 9mm AR
Carbine full weight/full stroke Gentle Recoil System
Переглядів 1,6 тис.2 місяці тому
Carbine full weight/full stroke Gentle Recoil System
Gentle Recoil System Wins a National IPSC Competition!
Переглядів 1,8 тис.3 місяці тому
Gentle Recoil System Wins a National IPSC Competition!
DIY 9mm AR Takedown Model? Fits in a 16" package.
Переглядів 1,8 тис.3 місяці тому
DIY 9mm AR Takedown Model? Fits in a 16" package.
Wilson Combat flatwire spring/Kynshot fit problem? Did WC change something?
Переглядів 1,3 тис.3 місяці тому
Wilson Combat flatwire spring/Kynshot fit problem? Did WC change something?
New 9mm AR Mistake - test firing and snap caps!
Переглядів 1,4 тис.3 місяці тому
New 9mm AR Mistake - test firing and snap caps!
$30 9mm AR Barrels! Good feeders or jam-o-matics?
Переглядів 2,2 тис.4 місяці тому
$30 9mm AR Barrels! Good feeders or jam-o-matics?
Use a standard AR upper for 9mm? Plus, Colt mag drop-free fix - it could be the upper!
Переглядів 1,3 тис.4 місяці тому
Use a standard AR upper for 9mm? Plus, Colt mag drop-free fix - it could be the upper!
Is 115gr 9mm in 3 inch AR subsonic?
Переглядів 1,1 тис.4 місяці тому
Is 115gr 9mm in 3 inch AR subsonic?
What is the length of the Barrel and Handguards. I gust bought a 5.5 inch barrel. It is still in the mail. Will be looking at Handguards that give the muzzle are recessed look
I have the Maxim. You do not want to preload the system. Does not work as well if you do.
So I have all this setup, your one of the few who mentions those spacer weights, is this necessary what exactly do they do?
You have convinced me that 9mm ar PCC s are worthless thank you 👍
I believe only MP5 and GRS have normal weight charging handle. The rest is heavy, right?
Pretty sad U Boob we have to take crazy practices to post video of Freedom tools .Thank for all the information. I may get this for my 16" Bronze Buster
Kewl comparison 🤩
A roller is a bearing, a roller bearing… really they’re all bearings
Another great vid! Is that the Scheel Gen 2 system? And is it in an A5 length tube? A like and share from me, as always.
Gen 2, A5.
They sell it with a carbine tube as well
You had me at the hk slap. Ergos are horrible though
The "Navy" trigger housing (shown) helps a lot with ergos. Not great, but better.
The wall was blocking half of the show. Is there a reason you can't move away from it. Or set up the camera on the other side?
Huh. I didn't notice. I'll have to look into that. 🙂
The Scheel really sings when you run lower pressure loads through it. Try setting it up with 147gr subs next time!
I run the Scheel in my #1 PCC competition rifle. Works great with subs or light 124gr loads.
Wrong. I have the Maxim and the " Gentle Recoil" system. I used the tungsten weights instead of two lighter weights which requires a longer buffer tube. I run a $1 5.56 carbine spring. No need for a flat wire spring. I shoot much heavier bullets. Shot a MP5 today using 115 grain factory ammo vs my Maxi system with my 150 power factor 147 yr bullets. Recoil was identical. You must not reload. Btw you need to spend some time in the gym to build up some muscle. I have no problem cocking the Maxim with a regular charging handle. You should do your tests with the same length barrels.
Grain not yr.Darn spell check.
No flatwire spring isn't needed. It's smoother and doesn't twang like a round wire spring. It's a review so letting people know the maxim is harder to charge than a regular Ar15/ Ar9 is part of a good review. Yes heavier bullets have less felt recoil. But 115gr range ammo is still what most people use and is a fair standard across the board. Did you really claim the maxim with your handloads is as soft as the mp5 with factory ammo?? I mean no duh.
@@ZChaosFactor What part of "I shot both today at our range" did you not understand? Several of my friend's were there and also shot both. Don't be a moron. Not becoming. I have been shooting in competitions longer than you have been breathing. Now run along little boy.
Lol.
@@ZChaosFactor I just made all of this up because I wanted to impress you - not. I have been shooting in competitions longer than you have been alive. I mean yes duh.
Would you be able to review the extar ex9. It shoots like a dream. I would like to hear your thoughts on it and how it compares to your builds. Thank you
Its just simple blowback right? the one I shot didn't seem anything special.
@@SenseiLlama Sub 500 bucks. Requires no lubrication, ever. Has an odd little rubber buffer in the rear of the buffer tube that flexes into a cavity. Simple and elegant.
@markrippt4677 seemed like decent enough firearm when I shot it. I don't know if I would describe it as shooting like a dream. I shot one of the cmmg 9s and holy cow.
My Kynshot buffer binds in both my flat wound buffer springs. Any suggestions?
Which flat springs? I tested 15 of them. The Tubb, AR Stoner, and Spinta are all the most loose and have good characteristics. blowback9.wordpress.com/2023/03/03/flat-wire-spring-comparison/
Great vid, I haven't actually heard of the scheel before so this was really interesting to see
So I actually talked to maxim defense on how to setup the RDB, they said to put it in the tube and tighten it up (with no plunger or spring) until it touches the bolt. It should be in contact with the bolt. So it kinda has a tiny bit of preload. Other than that I found it didn't really change much versus installing it with a gap and using the plunger and spring to lock it in.
Thanks for the info! I'm surprised they don't provide instructions and a few shims.
Yeah I dont remember seeing anything on installing it so eventually I just called and asked. it makes sense though because you don't want any sort of gap if you want to prevent bolt bounce. Essentially this way it acts as one continuous system.
Doug, is the MP5 system proprietary? I’m just curious as why it’s not used in other PCCs
Not a simple nor inexpensive solution. It is actually used in principle with the JP RDB, and gen (v) 2 stribog.
It's used / copied/ mimic in a couple other PCC's but it's not cheap or simple to design / build.
What they said! It's not proprietary, but it's tricky and expensive to implement. The HK German engineers did it right and balanced the forces of their system very well. A few others use the same principles, but it never seems to work quite as well. I only wish it had LRBHO!
Thanks for the responses!
I forgot to also mention the patent had long ago run out, very good clones exist, one actually made with the same machines.
Excellent video. I recommend comparing these with a good heavy buffer regular blowback option as well
The options tested already included the best blowback buffer recipe: the gentle recoil system. A heavy buffer might be the same weight as the GRS but will often bounce (unless it's a heavy buffer with a sliding weight that counters the bounce). The hydrolic dampener in the GRS does this and prevents bolt bounce.
Its already been tested before. All these setups blow the good old heavy blowback out of the water. We there's nothing to be gained from comparing them. Like was mentioned the GRS is an extra heavy direct blowback except with a hydraulic buffer.
I just recently switched from an 11oz buffer to the grs and it is significantly better way less jumpy
What everyone else said! The GRS is the step-up improvement I came up with over just a heavy 10-11oz. buffer. A heavy buffer definitely helps, but adding the hydraulic impact cushion component and a flatwire spring makes a big difference.
Thank you. I find your videos to be very informative, thank you for sharing. Does the hydraulic buffer compress when the buffer hits the rear of the buffer tube or before it starts sliding back?
Does the spring in the "buffer head" compress before the buffer slides rearward or when the buffer hits the back of the buffer tube before charging back forward to chamber the next round?
First one, then the other.
How would you compare the recoil reduction of the maxim to a JP silent capture buffer?
The silent capture buffer should be the same as just adding mass. The Maxim has a mechanical delay. The JP does not.
@@Blowback9 I see. Thanks for the info, and thanks for being dedicated to your passion/obsession! Lol
Keep in mind your length of pull folks.(ie ar-pistols) The three letter bois are always looking for a new canine to shoot. If you dont know about lenght of pull you need to research.
I can't find "length of pull" anywhere in the NFA or GCA as passed by congress. SCOTUS recently killed Chevron deference. Food for thought. I am not a lawyer, this is not legal advice.
Great video thanks for the information
I am running an Aero EPC receiver set and had an issue with the bolt locking back with 1 round left in the mag. After switching to one of Rudy's 5.5 "guaranteed to feed" barrels, no issues. I am also running his bolt and buffer with a flat wire AR15 buffer spring. Interested to see if you find different results. But Rudy's barrels REALLY seem to help. Even runs HST 147 JHP like butter. Great content as always!!!
Thanks for your continued work! Seems like hydraulics are definitely the way to go if you have the coin to spare.
You guys must be really weak.I am 75years old. I have zero issues pulling back a regular charging handle.
That must be it. Lol.
What is the total weight of reciprocating mass(bolt & buffer)? I’ve been using the KynShot RB5015 (21.5 oz) with a Wilson Combat spring in my SA Saint Victor 9mm with great results. No jams and perfect ejection.
14.7 bolt + 11.5oz. with the 5.5oz. K-SPEC and tungsten weights, similar to the original Gentle Recoil System. The K-SPEC doesn't have as good impact cushioning as the hydraulic buffers and doesn't perform well with this much mass. BTW, mass and springing in a blowback has little to do with jams and ejection. Those are due to the mag feed angle/height and the ejector position relative to the bolt.
I just cut four slots in the OD with a 1/16 cut off wheel.
I've just built my first AR9 from following your posts. Great stuff! Haven't gotten the chance to shoot it yet, but it has a KAK K-SPEC 9.5oz Buffer with the KAK Tungsten Bolt Weight on the standard carbine tube to get to 26oz. Any opinions on this? I'm just wondering if I'll run into any problems running the carbine tube.
Post how it goes
Just shot about 200 rounds through it. Very fun to shoot. Works fine, but unfortunately I haven't shot an AR-9 before so I don't have a frame of reference to recoil difference.
For the EPC, are you using an EPC upper/lower set or just the EPC LRBHO Upper? I switched to a Ballistic Advantage 8" and the feed cone have executed flawlessly with the G17 magazines. Current setup is a 10oz KVP tungsten buffer, standard spring, Foxtrot Mike Products BCG, and a very slightly touched pin from the LRBHO EPC upper (crimped less than a mm). Have not had issues with feeding yet but will comment if I get something weird or the jams come back. As always, LOVE, your videos. Such a fun hobby man, wish there were more dudes around like you to brainstorm with and try stuff out!
I have the EPC upper/lower set and a bunch of different non-enhanced feed cone barrels just for experimentation, but I think I found the problem. The LRBHO lever was pressing on the follower 1 round early, causing the follower to dip the nose of the last cartridge.
Appreciate the experimentation! 👍
Would you say the kynshot 5000hp in a carbine tube with those weights would feel similar to the traditional GRS? After finding your site and the GRS a friend added it to his ar9 that he always hated shooting and it immediately changed his mind and also has lead me to building my own. I just would like a shorter buffer tube if possible.
Yes the feel is very similar to the original GRS. I'm working with a company to make tungsten weights specifically for the AR9, but it's a little way off yet. This is all just proof of concept.
@@Blowback9 I look forward to that possibility! Thanks for all you’ve done for this section of the hobby!
How about a 10oz deadblow kak buffer and one 3oz weight?
That would only add mass. It's missing the buffer impact cushioning that helps make the GRS work.
Understood - based on your experience does the added mass improve the shooting experience through less perceived recoil? Clearly not to the same degree as the GRS, but a small improvement to a standard buffer system?
@@vincefasano1817 Yes. More mass does improve felt recoil by slowing the action and distributing the recoil impulse over a longer period of time.
With the 4" buffer what length buffer tube do i need
Standard carbine buffer tube with a 4" buffer and 9mm bolt.
I appreciate the website and related videos you put out Sir! I was having issues with my recent 9mm PCC build with the KAK colt magazine adapter. Turned out it was the ejector not sitting right in the bolt and this video helped sort me out! heated, bent, verified positioning. Now it runs like a beast.
I just built my first ar9 using your grs and used a ballistic advantage barrel, it has a large chanfer for feeding which is nice but I can see the back of the bullet. Is that normal or is something wrong?
Perfectly normal. See photos here: blowback9.wordpress.com/2022/08/18/4-step-guide-to-make-almost-any-ar9-run-100/
If you are worried about "pistoning" with those rounds? Drill some holes in the back of the buffer tube like H&K does for the OTB "Over the Beach" M16 modification. Lot easier than grinding tungsten.
The Aero Enhanced buffer tube has holes in each buffer detent notch too - that will help a lot with air flow.
Maxim defense is extremely underrated as a company
I'd love to see A5 tubes comparing the hydrolic buffer and 2 weights vs the KAK plus the TACCOM mini add on buffer spring.
did I do something wrong, I haven't had any problems with my AR9 I built from parts from multiple vendors
Nope. Most of the time everything will work "good enough" to function without major problems. Sometimes the stacking tolerances all come together for a system that works perfectly and feeds everything.
Does the K-Spec GRS variant have as much dot bounce as the hydraulic GRS?
I didn't compare them, but I'd expect so. Same mass moving in the tube.
Are these the 1”x3/8” pinewood derby weights for sale on Pur-Tungsten?
Yes.
I am a competitive shooter - IDPA PCC. What system would you recommend?
I am a competitive shooter PCC IDPA. What system would you recommend? I am currently running a KynSHOT 5015HD with a 5.56 carbine spring. I use 160 gr 9mm bullets at a 135PF. Gun shoot fairly soft. MY 45ACP AR shoots as soft as a MP5 using the same spring and buffer.
Im using a standard 556 lower..so i bought the sylvan arms magwell adapter and that has its own ejector that seems to be short..doesnt reach the top of the channel of the bcg. Is there a magwell adapter you can recommend that would work better and accept glock mags?
Great vid! It will be interesting to see how these work long term.
This is proof of concept/experimental. For anyone curious, these are the weights I'm using, but they needed some air channels and beveling for reliability. pur-tungsten.net/shop/3-oz-tungsten-pinewood-derby-cylinder-weight/
Anyone tried this with a side charger ar9?
Excellent as always. Do you by chance have the link to which ones you used?
pur-tungsten.net/shop/3-oz-tungsten-pinewood-derby-cylinder-weight/ $16 on sale. Very low price for tungsten.
Your channel must be giving them some traction. They're back up to $26 now lol. Eager to try them.
Appreciate all the work and enjoy the experimentation. 👍