CMMG MK4 Stripped Lower Receiver – Armor Black

The CMMG MK4 stripped lower receiver is built as a foundational component for AR-15 pattern builds. Precision-machined from forged 7075-T6 aluminum and finished in Armor Black Cerakote, this MK4 lower is supplied in stripped form and is intended for assembly with a compatible lower parts kit. It reflects CMMG's specifications for fit and function on AR-15 platforms.

Key Specifications

• The product type is a stripped lower receiver.
• The model designation is MK4.
• The receiver is machined from forged 7075-T6 aluminum.
• The listed finish is Cerakote Armor Black.
• The listed caliber on product attributes is .223 Rem / 5.56 NATO.
• The receiver is compatible with AR-15 platform parts and accessories.
• It can be assembled using mil‑spec lower parts kits.
• The product is described with Semi-automatic action compatibility in the provided data.
• Manufacturer-provided dimensional listing: 2.45 x 4.55 x 10.60 inches.
• AR-15 accessory compatibility indicated as: Yes.

As a stripped lower receiver, the MK4 provides a durable, service-oriented foundation for custom AR-15 builds. Its forged 7075-T6 construction and Cerakote finish offer a balance of mechanical strength and surface protection while maintaining compatibility with standard lower parts kits and AR-15 accessories. The MK4 is well-suited for builders who prioritize component quality and consistent fit when assembling a personalized rifle platform.