I want to put a 20" A4 upper on a lower with a carbine receiver extension with a collapsible stock. What is the best buffer for reliability? I've been reading a lot about it but I keep seeing answers all over the board. One respected manufacturer has recommended the standard Carbine buffer when using their 20" rifle gas upper on a carbine RE lower.
I've read that the Canadians with their C7A2 use a "HH" buffer, which I can only take to mean "H2". However, there are many threads of people having problems with H2 buffers and rifle length gas systems.
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