The CMMG Zeroed Lower Parts Kit Mk3 provides all essential components for your Mk3 build in convenient color-coded packets to simplify assembly. Compatible with CMMG Mk3 and most LR-308 type lowers.CMMG Zeroed Lower Parts Kit for Mk3Bolt catch assembly with screw-in pin plunger and springTrigger and trigger springDisconnector and disconnector springHammer and hammer springTrigger/hammer retaining pinsAmbidextrous safety selector with detent spring and screwMagazine catch spring and release buttonPivot/takedown pins with detents and springsA2-style pistol grip with grip screw and washerPerfect for builders looking for a complete organized parts solution for CMMG Mk3 and LR-308 platform builds with enhanced ambidextrous controls.