What buffer weight for my SBR?

[Reaper of the apocalypse]

Building my AR. Trying to decide the best buffer weight and spring. The barrel I'm gonna use is a Rainer arms 10.5" with .750 gas port.

 

[rkm456]

I can't think of a combination I've looked up where the answer hasn't been H2. So I'm going with H2.

 

[minniehill2]

Try both, start at H2 see if you can run a 3.

 

[84wh1]

I run a standard carbine buffer in mine. I've only got 100 rounds down the pipe but not a single issue. I ordered a dpms from brownells.

 

[Rebel Rouser]

You only need a H3 if the gas port is eroded.

 

[OldFrankHog]

H2 for a 5.56 if it's too much take out some weight. H for an x39.

 

[FoxAlpha]

I've been running an H buffer in my SBR with a DD 10.3 barrel without issue.

 

[terBC]

I've got a standard buffer running in my 8.5" it ejects exactly at the 3:00 position, I've got an H2 buffer that i'm going to try to see if that prevents brass flying directly to the person next to me.

 

[OldFrankHog]

Ejecting at 3 is borderline. Should be 4 o'clock 4:30. H is better in 7.5" and 8.5". 10.5" is still pistol length gas but add another 2 to 3 inches of pressure dwell time means you will need a little heavier. It will work with an H but you will probably eject at 2 o'clock.

 

[Sqr]

I run a standard carbine buffer in mine. I've only got 100 rounds down the pipe but not a single issue. I ordered a dpms from brownells.

^^this^^

Start with a standard buffer first and run the rifle for a few hundred rounds to see if the rifle cycles correctly. There is more to the rifle then the buffer weight as a SA or FA bolt carrier or a particular brand of spring can change the dampening effect.

Do not get hung up with these damn pie graphs for ejection patterns.

 

[Farmboy]

We have H2 and H3 buffer sets in stock here.

H2 would work well.