Nighthawk Custom's FM Series magazine releases are approximately 1/16" longer than a Colt-spec part to help you reach the button quicker and provide extra leverage for fast, positive mag changes when fractions of a second count. The deeply serrated face ensures non-slip thumb contact, yet won't snag on your holster, clothing, or other gear. The Nighthawk Custom FM Series mag catch lock and spring are the core to fast, smooth reloading, making these ideal for competition or carry. Fully Machined from 4140 carbon steel for long-lasting life and wear resistance, these parts are perfect for factory replacement, or to compliment your custom 1911 build. Gunsmith fitting may be required FeaturesFully machined4140 Carbon Steel30 LPI Checkering