Smith & Wesson Mainspring S&W 4003TSW, 4006TSW, 4043TSW, 4046TSW, 4553TSW, 4563TSW, 4566TSW, 4583TSW, 4586TSW, 5903TSW, 5906TSW, 5943TSW, 1006, 1026, 1076, 1086, 39, 3904, 3906, 3944, 3946, 439, 539
Features: Smith & Wesson factory part
Gunsmithing Required: Disassembly and Assembly required to replace part
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