Amazon.com | sports & outdoors > exercise & fitness > cardio training > treadmills | June - 2017
Each spring comes with an extra power firing pin retraction spring to offset the increased slide thrust. Mfg: Wolff SPECS: 1935, 9mm's original spring averages 17 lb. Extra power outputs for optimum functioning with hardball and hot handloads.
Amazon.com | sports & outdoors > snow sports > skiing > goggles | June - 2017
A variety of reduced power recoil springs to match your handloads and provide optimal slide function. Includes (1) 14 lb., (1) 15 lb., (1) 16 lb. and (1) 17 lb. reduced power recoil springs; and (3) extra power firing pin springs. Fits 9mm (.380) pistols. Factory standard recoil spring is 20 lb. Mfg: Wolff