Buffer for 18" Rifle Length Gas System/Carbine Extension

I've picked an OEM BCM upper with 18" barrel and LaRue floating rail with a pinned gas block. This was a BCM built upper, it's a few years old but looks unused. I want to put in on an LMT carbine lower that I've got.

I'm unsure which buffer would be appropriate. An H3?

I'd appreciate an informed suggestion.

(My search didn't turn up anything)

TIA

When life plays a joke on you..............joke back.

Original Post

In my 18 incher I run the standard carbine buffer and spring that came with the Magpul Moe stock I put on.

Only 305 rounds down the pipe thus far, but I can say it has had no malfunctions, runs very smoothly, with everything I've put through it-XM193. M855, my own loads, crappy Tulammo, and others.

Ejects back out right at around 3-4 o'clock.

I am assuming rifle length gas tube, the regular buffer should be fine.  Given the rifle gas tube allows the longest dwell time, there shouldn’t be any need for extra mass on the buffer.  It’s just added reciprocating mass at that point.   

One more thought on the issue.   20$ on Amazon you can buy 3 tungsten buffer weights.   With those and a regular carbine buffer you can make a h1, h2, or h3.   Allows you to mess around with different buffer weights and see which runs best.

FWIW Bravo Company Manufacturing's website list the RECCE 18 rifle as having a rifle length gas system and an H buffer in it's collapsible stock.  I'd start with that. 

I'd defer to Sully and some of our smarter armorers to give you additional advice.  I was going to write up my personal TTP on buffers, but I figured BCM is smarter on their stuff than I am.

___________________________________________________________________

I'm either dead right, or horribly wrong. Either way the results should be entertaining.

 

"Shoot the MOTHERF$%^ER until he changes shape or catches fire"  the PAT ROGERS

An H buffer will be fine. An H2 is more mass moving, but has the advantage of more positive return to battery when it starts getting dirty. 

If you’re not going to run it that hard or shoot it suppressed a lot, just go with the H. 

“Is that when you snap a guy’s neck after you been torturin’ him, so he don’t gotta go through the rest of his life with a colostomy bag?”

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