I shot my Infallible trigger VH Parker Burt Becker inspired pigeon gun this week, only 50 birds, but it worked great. I have Infallible guns in DH Parker, VH Parker, Prussian Daly hammer gun, and another DH Parker. They all work great. You have to pay attention while you are shooting, but the trigger is not at fault if you fail to check the selector. Pigeon shooters always have a full gun, so there is no problem.