Wilson Combat's drop-in beavertail grip safety provides better control of your pistol while eliminating the discomfort and hammer bite that are possible with stock grip safeties. The drop-in safety is designed to work with a commander style hammer or a bobbed spur hammer. Due to variations from one pistol to the next, slight modifications to the beavertail's trigger engagement area may be required for proper operation. Fits Colt Style 1911 Frames. Compatible with the following pistols: Auto Ordnance 1911A1, Pit Bull; Colt 1991A1, Government Model, Gold Cup; Ithaca 1911A1; Military Issue 1911A1; Norinco 1911; Para-Ordnance GI Expert, P-12, P-13, P-14; Remington R1; Rock Island Armory Full-Size 1911, 1911; Springfield Armory Mil-Spec 1911.