Colt Firearms Lower Parts Kit Features The Colt Firearms Lower Parts Kit is built to fit small pin mil-spec AR-15 style lower receivers giving a builder everything needed to go from a stripped receiver to a functioning fire control group. Included in the kit are the trigger hammer disconnector and pistol grip the core components that turn a bare lower into a working rifle platform. Because every part comes from Colt the single company that originated the AR-15/M16 design and continues to supply the U.S. military the components are engineered to work together without the fitting issues that can arise from mixing parts across brands. This single source consistency saves a builder time at the bench and reduces the chance of malfunctions from mismatched tolerances. Finishing a stripped lower with a kit like this is one of the most common steps in an AR-15 build and sourcing genuine Colt parts gives the finished rifle a direct link to the platform s military heritage. The black finish on the included components matches standard mil-spec hardware so the lower blends in with the rest of a typical build rather than standing out. Keeping a spare kit on hand is also useful for armorers performing repairs since a broken trigger or disconnector can otherwise sideline a rifle. The Colt Firearms Lower Parts Kit offers a straightforward factory sourced way to complete or service an AR-15 lower available for sale at GrabAGun. Colt Firearms Lower Parts Kit Specifications Manufacturer: Colt Firearms Model: Lower Parts Kit Type: Kit Color: Black Fitment: AR-15/M4 Small Pin Includes: Trigger Hammer Disconnector Pistol Grip Available At: GrabAGun