CMMG MK4 Lower Receiver Assembly in Tungsten

CMMG MK4 Lower Receiver Assembly

The foundation of any quality AR15 build starts with a precision-machined lower receiver, and CMMG delivers exactly that with their MK4 Lower Receiver Assembly in Tungsten.

Design and Construction

This lower receiver is engineered to exacting specifications for reliable function and durability. The Tungsten finish provides a professional appearance while offering corrosion resistance for long-term use in the field or at the range.

Key Features

• AR15 Platform Compatible — Works with standard AR15 upper receivers and components
• Precision Machining — Tight tolerances ensure reliable cycling and accuracy
• Tungsten Finish — Durable coating resists corrosion and wear
• Complete Assembly — Comes fully assembled and ready for upper receiver installation

For the Builder

Whether you're assembling your first AR15 or adding to an existing collection, a quality lower receiver is non-negotiable. CMMG's reputation for precision manufacturing makes this an excellent choice for shooters who demand reliability and performance. The MK4 platform offers proven design that works seamlessly with thousands of available upper receiver options.

Ready to Build

Pair this lower receiver with your choice of upper assembly, and you'll have a rifle that performs as well as it looks.