I had actually forgotten that.
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I had actually forgotten that.
Exactly. Carrier bounces rearward after impacting the rear face of the barrel extension. This occurs after the carrier has tripped the autosear which has released the hammer. The hammer impacts the firing pin/carrier cocking ramp while the carrier is traveling rearward, resulting in hammer follow without primer ignition. I had this issue on my M16 when I first swapped to a 10.5” upper and was still using a standard CAR buffer. Interestingly I purchased a Commando 2-piece mechanical buffer that was out of spec and the two pieces were bound together. That produced immediate hammer follow within the second round. H buffer corrected the issues. I have since swapped to h2 and h3 buffers in my M16s.