Looks like it’s a right handed self-loading shotgun...I hope the hull busted him on the lip. You know the corner of the butt popped his armpit a good one.
I don’t recall seeing many shotguns that blow gasses out the side of the barrel like that, either....wonder if the SS put blanks or something in it so he wouldn’t shoot himself.
Its an over/under looks like a Browning Citori.
The gun is ported, he also looks like he sighting into the release. This is probably one of the first few shots he took.
I thought that might be a muzzle brake, but that’s illegal isn’t it?