Chambered for the .45 ACP cartridge. Fitted with 3.75" barrel. White-dot front sight and Novak Lo-Mount rear. Aluminum-alloy frame with stainless steel slide. Magazine capacity 7 rounds. Weight 29 oz. The 4513 is traditional double-action; while 4553 double-action-only. Note: Deduct $50 for double-action-only model 4553.