POF-USA's single-stage Drop-in Trigger system features a crisp pull and is assembled in a red anodized aluminum housing. The Trigger, Disconnect, and Hammer are all Nitride Heat Treated to 70 Rockwell. As a result, these parts are very strong and corrosion resistance. When assembled, POF-USA's signature rubber urethane feet keep the unit snug in the lower receiver. Includes custom-fit stainless steel KNS Precision Anti-walk Pins for both standard AR and POF-USA ambidextrous lower receivers. FeaturesVirtually no creepExceptionally crispRed anodized housing machined from 6061 aluminumPrecision machinedIndividually inspectedIncludes free anti-walk trigger pinsFits AR type lower receivers manufactured to mil-spec dimensions Note: POF-USA does not recommend the use of this drop-in trigger in any 9MM, 40 S&W, 45 ACP, 10MM, or any other Pistol Caliber Firearm. The use of this drop-in trigger in any Pistol Caliber Firearm will VOID the triggers warranty.