Part# 27616 Wolff Precision GunSprings for S&W Pistol
Reduced Power Hammer Spring (Long) 16 LB Pak of 2 New Old Stock
For Use In:39*, 439, 539, 639, 3904, 3906, 3944, 3946, 9mm
59*, 459, 559, 659, 5903, 5904 and 5906, 9mm
5923, 5924, 5926, 5943, 5944, 5946, 5967, 9mm
909, 910, 915, 9mm
645, 745, 4506, 4526, 4536**, 4546, .45 ACP
4566, 4567, 4576, 4586, 4596, .45 ACP
1006, 1026, 1066**, 1076, 1086, 10mm
410, 411, .40 S&W
4003,4004, 4006,4026,4043,4044,4046***, .40 S&W
*Early 39/ 59 pistols had a 22 Lb. factory spring.
** Some pistols may have short hammer springs
***Some 4046's have a 16 Lb. factory hammer spring.
Smith & Wesson Pistols use 2 different hammer springs (Long - Group A & Short - Group B) for most centerfire semi-automatic pistols