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I recently ordered a 20" AR15 Upper, A2 stock kit was out of stock. I currently have the parts to build a lower with the carbine/collapsible stock kit.

My question is there anyone who runs a 20" AR with the carbine buffer tube, buffer spring, buffer and collapsible stock?

Any do's and don'ts, advice?

Before I had a suppressor and had to go with a 16" barrel, I had a 20" with a collapsible stock. It needed a H buffer, but everything comes with that now.

Running a stock 20" Colt 1:9 upper on a dead stock Colt LE 6920 carbine lower, not a single part change required and not a single problem. 3-9 Explore Optics tactical (railed) scope, good so far out to 600 yards. Credit to AndyC for pic.

Ignoring differences in carbine vs rifle spring resistance, from my research, general consensus seems to be that when using a 20" Rifle Upper with rifle gas system on a carbine lower/buffer tube that H2 carbine buffer 4.6 oz or H3 carbine buffer 5.5 oz or or a damage industries H6 carbine buffer 5.0 oz. is optimal to get the same performance as a rifle buffer 5.0 oz.

The main difference between the H3 and H6 is the H3 has 3 weights and the H6 has 6 weights. The 6 weights are supposed to help further eliminate the bolt bounce back somehow.

FYI the H6 buffer is what the USMC has adopted when running a 20" Rifle on a carbine tube lower. I didn't know they did that. I thought is was just those crazy Canadians with the C7/C8 variants.

I had a LMT Lower with Sopmod on the twenty I had. I have since went to an 18" hbar and am still running the same lower. No changes at all in the lower.

LSUTiger wrote:I recently ordered a 20" AR15 Upper, A2 stock kit was out of stock. I currently have the parts to build a lower with the carbine/collapsible stock kit.

My question is there anyone who runs a 20" AR with the carbine buffer tube, buffer spring, buffer and collapsible stock?

Any do's and don'ts, advice?

I have an 18" AR15 in a DMR/SPR configuration that I run with a collapsible stock, but it isn't the cheap carbine M4 stock. I use a VLTOR EMOD stock.

This is the rifle (has a different optic on it now):


The stock is comfortable and allows for adjusting length of pull. It has a steel striker plate for whenever someone needs buttstroking, a storage compartment for your skittles, and a battery storage tube on either side of the cheek rest. Not cheap, but not as expensive as a higher end Magpul stock.

If you like the fixed length of the A2 stock, a buddy of mine has build a 20" precision AR (and hits reliably at 800 yards with it), and he uses a VLTOR ARM buttstock, which is a little lighter than the EMOD, and has the same cheek rest and waterproof battery storage as the EMOD:



If I were building a fixed length stocked AR right now, that's the one I'd probably go for.

My 20" has been just fine with a Spikes T2 buffer.

I had a 20" govt profile upper with a LMT Sopmod stock for quite awhile. Worked great. I now have a 18" HBAR upper on it. I think the 20" govt profile actually balanced a little better.