CMMG MK4 Stripped Lower Receiver Armor Black .223/5.56

Description

Precision machined from forged 7075 T6 aluminum, the CMMG MK4 stripped lower receiver is built as a mil-spec foundation for AR-15 builds. It ships unassembled and accepts standard mil-spec lower parts kits and controls. The receiver is finished in Armor Black Cerakote and is marked for .223 Remington / 5.56 NATO.

Key Specifications

• The receiver type is stripped for custom assembly.
• The model designation is MK4.
• The material is forged 7075 T6 aluminum for a durable, lightweight platform.
• The finish is Cerakote Armor Black.
• The caliber marking is .223 Rem / 5.56 NATO.
• The listed action is Semi-Auto.
• The weight is 0.69 lbs.
• It is compatible with mil-spec lower parts kits.
• It is designed to fit AR-15 platforms.

A solid, accurately machined lower like the CMMG MK4 provides a dependable starting point for a custom AR-15 build. With forged 7075 T6 construction and a Cerakote Armor Black finish, it balances strength and corrosion resistance while remaining compatible with mil-spec components—making it a practical choice for builders seeking a reliable, high-quality lower receiver.