I recommend not shooting steel cased ammo through them. I had four KA-BOOMS in my S&W mag. version-all with steel cased ammo. Three of them were reloaded Tula 9mm Boxer primed cases (done as a feasablilty study, which needlessly to say, failed) and a Chinese steel cased surplus round that caused some light injury beyond the numb hands from the other three. (all fired out of battery-it never happened with factory or reloaded brass, or the factory Tula.) As 100% reliability with whatever ammo might be available was a non-negotiable parameter for me, I traded it for a Star BM with caveat to the buyer to not shoot steel cased ammo. Other wise, I found it accurate, a joy to shoot, and very handy.