The CMMG Mk3 lower receiver is just the thing you need to start an AR10 style build. Based on the DPMS LR308 gen 1 high pattern design the Mk3 platform is compatible with the most common and popular .308 AR parts on the market.Whether you want to keep your Mk3 lower build simple with a Mk3 Lower Parts Kit or switch things up with CMMG's Gunbuilder's Lower Parts Kit and an AR10 Drop-In Trigger the Mk3 Stripped Lower features AR-15 like modularity and can even utilize the same Pistol Grips. Check out CMMG's Buffer Tube & Stock Kits to finish out the Mk3 Stripped Lower. Accepts LR308/SR-25 pattern magazines.