The CMMG Gunbuilder Kit is a customizable lower parts kits for the LR-308 platform. This kit provides all the minor, mil-spec parts generally used in an LR-308 build, while still allowing the flexibilty to add common aftermarket upgrades, such as a pistol grip and match grade trigger components. Customizable lower parts kits offer an economical way to get all the small pieces needed for an LR-308 lower, without wasting money on the parts you won't use!Kit Includes: .308 Bolt Catch Screw.308 Front Pivot Pin .308 Take Down Pin Bolt Catch Bolt Catch Buffer Bolt Catch Spring Buffer Retainer Pin Buffer Retainer Spring Detent Selector Detent Spring Hammer Pin Magazine Catch Magazine Catch Button Magazine Catch Spring Selector Selector Spring Take Down Detent Trigger Pin