CMMG Mk4/AR-15 Lower Receiver Assembly Features The CMMG Mk4/AR-15 Lower Receiver Assembly is forged from 7075-T6 aluminum a material chosen for its strength to weight ratio and consistency across production runs. Built to the Mk4 platform this lower receiver assembly is designed to integrate cleanly with CMMG s broader parts ecosystem as well as standard AR-15 components. A Cerakote finish is applied as standard giving the receiver added resistance to wear corrosion and the daily wear and tear of range use. Forged construction rather than cast generally offers tighter tolerances and a more durable final product for a builder assembling a rifle meant to last. Finished in Tungsten this lower receiver assembly brings a distinct modern color option to a build that might otherwise be finished in standard black. The assembly form factor means key components are already installed reducing the amount of hand-fitting a builder needs to do before mating it to an upper. For AR-15 and Mk4 platform builders who want a durable finished lower with a standout Cerakote color the CMMG Mk4/AR-15 Lower Receiver Assembly in Tungsten is available for sale at GrabAGun. CMMG Mk4/AR-15 Lower Receiver Assembly Specifications Manufacturer: CMMG Model: Mk4/AR-15 Lower Receiver Assembly Caliber: Multi-Cal Material: 7075-T6 Forged Aluminum Finish: Cerakote Color: Tungsten Available At: GrabAGun