The a single slamfires I've listened to about with AR-15s can be a results of a caught firing pin extruding from the bolt facial area producing it to operate like an open bolt submachine. It's going to possible hearth clear of battery like that. The latest circumstances, like the 1998 https://elliotturvom.mpeblog.com/55751590/the-2-minute-rule-for-winchester-large-rifle-primers