I am running a 12 inch heavy barrel XCR with a Quicksilver can. I broke a firing pin after about 7000 rds. It happened while taking a training course with EAG Tactical. Called Alex and they sent over new 3 pins no charge, got the pins, wrong pins. They changed the design of the firing pin. Back up and running. FWIW, operators may want to keep a spare pin w/punch/hammer to change out in the field. I raped my partners XCR in order to finish the course.