Preferred 9mm buffer and spring?

[OldTengu]

Looking to piece together an ar9 pistol. Pretty uninitiated to them. Advice on preferred spring and buffer? Can I use a KAK shockwave that I already own? Preferred lowers? So many questions.

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[Member 34319]

I've done a handful.

Best thus far has been my CMMG, factory built however. It's not a typical AR9 recoil system though. You can buy their kits now to build on anyone's upper, you'll have to remove the ejector in most lowers though. I use a plain old carbine spring and a H2 buffer with it. Shoots very smooth.



My most recent attempt at a traditional AR9, I'm using a Taccom BCG and a 7.5 ounce extended 9mm buffer with a carbine spring. I'm pretty sure I'm short stroking right now as my last round hold open is not engaging. It shoots really fast, but it does has noticeably more recoil than the CMMG. Probably because the guns weighs nothing.

Build Thread - AR9




You can use the KAK tube you already have.

Their are tons of great lowers out there. Price and features vary. My most recent was a Foxtrot Mike lower with a really nice last round bolt hold feature. New Frontier sells theirs for a really good price as does Palmetto State.

 

[NWCustomFirearms]

Last few that we did we used an AR10 buffer spring with a hydraulic buffer and that seemed to work great.

 

[spookshack]

KVP 7.5oz buffer and a .308 (AR10) buffer spring in a my carbine with 16in barrel. No issues.