CMMG's Gun Builder's Lower Parts Kit is a collection of components intended for compatible AR-15 lower receivers. The kit is designed to provide the small parts needed to complete a stripped lower receiver, while omitting commonly customized components such as the trigger and hammer, pistol grip, and trigger guard. Listed components include pivot and takedown pins, detents and springs, safety selector components, magazine-catch components, bolt-catch components, and buffer-retainer hardware. | CMMG Gun Builders Lower Parts Kit