The CMMG Mk4/AR15 stripped lower receiver is chambered for .223 Remington and 5.56 NATO. It is forged from 7075-T6 aluminum and built on the AR-15/M4 lower pattern. The receiver accepts mil-spec AR-15 lower parts kits and AR-15/M4 pattern magazines. Its finish is Armor Black Cerakote, which the listing describes as corrosion resistant with a uniform look.

This receiver suits a builder who wants a solid starting point for an AR-15 style rifle, using a common lower pattern that takes standard parts. The stripped format lets the buyer choose the rest of the components to match the intended use, such as range shooting or a hunting setup. Hunters should confirm their state wildlife agency's rules for AR-15 rifles and calibers before choosing the build.

Key features

• .223 Remington and 5.56 NATO, stripped
• Forged 7075-T6 aluminum construction
• AR-15/M4 pattern, accepts mil-spec lower parts kits
• Accepts AR-15/M4 pattern magazines
• Armor Black Cerakote finish

This stripped receiver ships to a licensed FFL dealer you name, where you complete Form 4473 and pass a background check.