I just bought a Security 380. I took the slide off and I swear the fire control unit (also called the frame insert. #1 in the manual) looks like it made out of plastic. The slide rides on it and the serial number is on it and if it breaks, it's game over. Now I know Ruger has some type of a warranty, but it's kinda got me freaked out. Maybe i'm wrong and its metal. But it looks like plastic.