We recently had a veteran tell the USPSA Range Officer that the Marines had taught him all about handling firearms.
Right before he shot himself in the leg.
As reconstructed, he loaded his new CZ and slammed it into the new racer holster without setting the safety, the RO yelling "Stop, Sto-" BANG. Apparently hitting the clamp block of the holster at an angle that brought it against the trigger.
The surgeon was scheduled to dig the bullet out last Friday.