kenturner64 first build

**kenturner64** · 12-14-17, 19:58

I have a 16" barrel with carbine length gas tube .
what weight buffer should I use

**thehammer69** · 12-14-17, 21:10

Not knowing your gas port size, the answer would honestly be a guess. But a Colt 6920 uses a H2 buffer with it's factory barrel...which is a carbine length 16"

**Iraqgunz** · 12-14-17, 22:03

Knowing who makes the barrel is half the battle. With that said almost all carbine length barrels will run with at least an H2 buffer.

Originally Posted by kenturner64

I have a 16" barrel with carbine length gas tube .
what weight buffer should I use

**MistWolf** · 12-15-17, 01:01

Originally Posted by kenturner64

I have a 16" barrel with carbine length gas tube .
what weight buffer should I use

You're looking at it backwards. You don't ask "what buffer should I use?" because that's already known. Carbine buffers that work right are the H and H2 buffers. We also know that rifle buffers (which are about the same weight as H3 buffers) work.

Therefore, what you need to do is select which RE you're going to use (carbine, A5 or rifle) us the right buffer (H or H2 for carbine, A5H2 for A5 and rifle for rifle.), then select the right gas port size. As you're planning to use a 16" barrel with a carbine length gas system, your gas port should be .0625". Why should it be .0625"? Because that's what Colt uses in their 16" carbine gas barrels and it works. Colt supplies H buffer with their civilian carbines and SBRs.

If your AR needs a buffer heavier than about 5.3 oz (the weight of a rifle buffer or an A5H2 buffer) you need to look into reducing gas flow.