CMMG Barrel Sub-Assembly 55DE10A 16.1" 5.56x45mm NATO 4140CM Nitrided M4 Profile for AR-15.

The CMMG Barrel Sub-Assembly 55DE10A is designed for AR-15 platforms, featuring robust construction and reliability. It measures 16.1 inches and is chambered for 5.56x45mm NATO, suitable for building or upgrading your upper receiver.

• 4140 chrome-moly steel with salt bath nitride finish
• Carbine-length gas system with M4 profile
• 1:7 twist rate for bullet stabilization

This barrel sub-assembly is properly headspaced and includes an M4 barrel extension, ready for installation on AR-15 uppers. It offers a proven combination of material quality, precision, and compatibility.