Description Recoil springs are available in a variety of load ratings to allow adjustment of the recoil function to meet various requirements. All load-rated recoil springs include an extra power firing pin spring. For Use in: 410, 411, .40 S&W 4003, 4004, 4006, 4026, 4043, 4044, 4046, .40 S&W Reduced Power…: 12, 14 & 16 Lb. Factory Standard.: 17 Lb. Extra Power……..: 18, 20 & 22 Lb.
