Smith & Wesson Magazine Spring S&W 4003TSW, 4003TSW, 4043TSW, 4046TSW, 4003, 4004, 411

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.