I'm curious. The M4A1 has a H2 buffer to eliminate (or reduce) 'bolt-bounce' when firing in full auto, but does mid-length gun require H2 buffer to function reliably when fire in full-auto as well? How well does mid-length gun perform in full auto using only "H" buffer? Have they ever been tested extensively with full-auto fire to the same extend that the M4A1 had?


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