Wolff Browning Hi-Power Recoil Calibration Pak

For optimum reliability with hardball and hot handloads. Improves overall function by matching the spring to the specific loads being fired. A wide range of recoil springs to match your loads and shooting conditions. Fits 9mm and .40 S&W pistols. Recoil Pak includes: one 17 lb, one 18.5 lb, one 20 lb, and one 22 lb conventional recoil springs, plus three extra power firing pin springs. Variable Pak includes: one 10 lb, one 11 lb, one 12 lb, one 13 lb, one 14 lb, one 15 lb, and one 16 lb variable power recoil springs, plus three extra power firing pin springs. Factory springs: 9mm is 17 lb; .40 S&W is 20 lb.