TexasCHLforum.com

There are "slap-fire" discharges from SKS rifles due to materials' failures. There is a Youtube video on that. Doubt that happened here but who knows until an expert examines the handgun and can replicate the failure.

In any event, obviously, he should not have pointed it at his brother. He will now have to live with that the rest of his life. Had he pointed the gun down at the ground while he was trying to clear the action this tragedy would not have happened.