I’ve seen bulges like that, I’ve seen split barrels. I don’t think I’ve ever seen a true explosion or anything like that. I’ve seen polymer pistols do weird stuff like the grip split and kick the magazine out in pieces.
I’ll take a lot of flak for saying it, but that’s why I buy factory ammo and shoot Glocks. It is an extreme rare occasion where I am shooting a competition and see a malfunction with a Glock shooting factory ammo from factory mags. It just doesn’t happen.
Bookmarks