CMMG Mk4/AR15 Lower Receiver Assembly Features The CMMG Mk4/AR15 Lower Receiver Assembly is forged from 7075-T6 aluminum a high-strength alloy widely used in AR-15 construction for its combination of light weight and durability under repeated recoil cycles. Built to the Mk4 platform standard this lower receiver is compatible with a broad range of AR-15 uppers giving builders flexibility when pairing it with a barrel and caliber of their choice. As a multi-caliber receiver it is not limited to a single chambering making it a versatile starting point for a dedicated build. Forged construction rather than billet or cast gives the receiver added strength and consistency at a price point that remains accessible to builders. A Coyote Tan Cerakote finish is applied as the standard coating providing a durable corrosion-resistant surface that also gives the rifle a distinct tactical appearance compared to a standard black receiver. This finish is applied with the same ceramic-based technology used across many firearm components for its resistance to wear moisture and handling over time. As a lower receiver assembly this component forms the serialized heart of a custom AR-15 build pairing with the builder s choice of upper barrel and furniture. For anyone assembling a personalized rifle the CMMG Mk4/AR15 Lower Receiver Assembly offers a strong well-finished foundation to build around. CMMG Mk4/AR15 Lower Receiver Assembly Specifications Manufacturer: CMMG Model: Mk4/AR15 Lower Receiver Assembly Caliber: Multi-Cal Material: Forged 7075-T6 Aluminum Finish: Coyote Tan Cerakote Available At: GrabAGun