Smith & Wesson Magazine Spring S&W 4513TSW, 4553TSW, 4566TSW, 4583TSW, 4586TSW, CS45C, CS45D, CS45S, CS9D, 4505, 4506, 4516, 4526, 4536, 4546, 4556, 4566, 4567, 4576, 457, 457D, 4586, 4596, 645, 745

This Smith & Wesson factory part may require Disassembly and Assembly to replace it. Some parts may require installation and fitting by a qualified gunsmith. Factory replacement parts are manufactured to the exact same specifications and tolerances and use the same manufacturing materials as the original parts.