That was my recommendation as well.
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After alot of experimentation on my LMT carbine lower/tube, I am running my 20" rifle with an H buffer. Soft and reliable even with Wolf.
Soft shooting 20 inch with rifle gas....I should imagine a basic carbine buffer will be completely fine. As always, for optimal, YMMV due to differing factors with different barrels, such as gas port size etc.
Perhaps, I didn't provide enough info? ....like that it's mostly a stock RR A4 NM rifle. or....I'm not sure if some folks just prefer to ignore that I said I already have the complete LMT SOPMOD collapsible stock, and I am shooting 77 grain bullets.
After reading all the input, it seems KSA464 and Sirpleasant seem to think an H or H2 will work for my purposes.
Thanks for the input gentlemen. My only decision now is between the H or H2 buffer.
H3... rifles barrels kick out a lot of gas, and were designed for use with a 5.5oz buffer. you'll have best results with the heaviest buffer you can find.
i have no experience with the vltor A5 system, but from what i hear, and what i know about vltor products, it's probably the best option for you.
Perhaps the H3 is optimal, but the whole physics of the rifle buffer system are completely different. It's not as simple as a little stiffer spring. It's a completely different spring cycle.
Two completely different spring lengths are compressing the exact same amount. This is what makes the A5 such a game changer.
You get the rifle spring cycle on a sliding stock.
OP, are you also having the barrel cut down? you say you are making this a "carbine," and you never clarified whether or not you were simply switching to a carbine stock or also cutting down the barrel.