Serrations and bump on trigger guard to help control recoil and Serrations on top of beaver tail reduce glare. Flared mag well thumb accelerator pad. Advanced contour grip with aggressive texturing. Picatinny rail (not a Glock rail) MIL-STD 1913 Picatinny. High beaver tail with low profile bore axis and holster compatibility slide stop guard. Larger trigger guard for better access with gloves. Recessed contoured mag release area for faster mag changes. Multi caliber- Compatible with compact 9mm 40 cal 357SIG. Weight 3.5 oz. without Locking Block.