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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.

You had me at the hk slap. Ergos are horrible though

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?

The Scheel really sings when you run lower pressure loads through it. Try setting it up with 147gr subs next time!

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.

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

My Kynshot buffer binds in both my flat wound buffer springs. Any suggestions?

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.

Doug, is the MP5 system proprietary? I’m just curious as why it’s not used in other PCCs

Excellent video. I recommend comparing these with a good heavy buffer regular blowback option as well

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?

How would you compare the recoil reduction of the maxim to a JP silent capture buffer?

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.

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.

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.

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.

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!

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.

How about a 10oz deadblow kak buffer and one 3oz weight?

With the 4" buffer what length buffer tube do i need

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?

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.

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

Does the K-Spec GRS variant have as much dot bounce as the hydraulic GRS?

Are these the 1”x3/8” pinewood derby weights for sale on Pur-Tungsten?

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?

Appreciate all the work and enjoy the experimentation. 👍