Regarding the buffers in Military issued select fire m4's. The M4 had an H buffer, when the M4a1 was introduced, the buffer was upgraded to H2. In a non select fire carbine, IE colt 6921 or 6920, is the h2 buffer necessary? Or will an H suffice? Ammo being used will be brass case 5.56, and speer gold dot. No steel or cheap crap lol
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