The Mk3 Gun builders kit includes most of the necessary parts to build up your lower group except the commonly upgraded parts. Does not include Fire Control Group, and pistol grip. Compatible with CMMG Mk3 Lowers and most LR308 type lowers.
Not all 308 lowers are the same. This kit is designed to work with most lowers, and are “Mil-Spec”.
Basic parts list: takedown pin, safety selector, bolt catch, receiver pivot pin, selector detent, bolt catch plunger, takedown pin detent (2), magazine catch, bolt catch spring, takedown pin detent spring (2), magazine catch spring, bolt catch screw, hammer and trigger pin (2), magazine release button, buffer retainer and buffer retainer spring.