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The CMMG Gun Builder's Lower Parts Kit contains most of the necessary components you need to build up your Mk3 or LR308 lower receiver—except for commonly upgraded parts like the trigger group and pistol grip.
PLEASE NOTE: Not for use with AR-15 lowers. Compatible with Mk3 lowers and most LR308-type lowers. CMMG recommends checking with the manufacturer of your lower for compatibility.