Ammo is '23 factory Igman 55gr 5.56 M193.
Round was failure to fire, did a slap-rack-bang, but no 'bang', just another 'click' w/a resultant double-feed.
Yanked the mag & double-feed out, bolt wouldn't fully close, had to use a cleaning rod to tap out the recalcitrant round.
Examined the recalcitrant round and discovered something I've never seen in several decades of shooting:
Attached FileAnyone got a plausible explanation as to why the primer is extruded w/a firing pin mark *after* the attempted firing? (There is powder in the casing and the extractor did tear the rim off the recalcitrant round)
It couldn't have been extruded prior to attempted firing or the bolt couldn't have locked up enough to drop the hammer in the first place.