So yesterday at the range, I had to mortar clear my rifle. The round came out; the case looked ok. No marks on the primer. I loaded the cartridge again and the round went off. What could have caused this? The upper is relatively new, has probably close to 1,000 rounds through it. It’s the first malfunction I’ve had since the upper was assembled. This was the first session with a Colt MPC bolt I just picked up. Could it be that the bolt just needs to be broken in? Ammo used for most of the session was Guatamelan 5.56x45 M193, all shot with no problem. The round that gave me the problem was PPU Prvi Partisan 223 75 grain.
Upper specs: Noveske Gen 1 upper, Colt Socom 14.5 barrel, Noveske BCG, Colt bolt, Colt Copper color extractor.
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