CMMG AR-15 Barrel Nut – Standard Mil-Spec Threading

The CMMG AR-15 Barrel Nut is a direct replacement component that secures the barrel extension to the upper receiver and provides the mounting platform for your handguard. This is a wear item that should be replaced if threads show damage, if you're switching handguard systems, or during a barrel replacement. CMMG produces this nut to mil-spec dimensions for reliable function with standard AR-15 platform uppers.

Machined from steel with a phosphate finish for corrosion resistance, this barrel nut features standard wrench flats and requires a barrel nut wrench and torque wrench for proper installation. Installation demands careful torquing to manufacturer specifications and proper alignment of gas tube clearance—professional installation is recommended unless you have armorer-level experience and the correct tools. Not compatible with free-float handguards that use proprietary mounting systems.

• Part Type: Barrel Nut
• Compatible Firearms: AR-15 platform rifles with mil-spec upper receivers
• Material: Steel
• Finish: Phosphate
• Installation: Professional Recommended – requires barrel nut wrench, torque wrench, and proper gas tube alignment
• Includes: Barrel nut only (no wrench or hardware included)