The CMMG Barrel Nut (brand part number 55DA244) is an AR-15 barrel nut built specifically for use with CMMG free-float hand guard systems. CMMG machines this barrel nut to its own free-float hand guard tolerances, giving builders and gunsmiths a factory-correct part when installing or replacing a CMMG free-float hand guard rather than relying on a generic mil-spec nut that may not index or torque correctly. It’s a small part that does critical work, threading onto the barrel extension to lock the hand guard’s mounting interface securely to the upper receiver. For anyone running or building out a CMMG free-float hand guard setup, this is the correct barrel nut for the job.

Key Specifications

• Purpose-built for compatibility with CMMG AR-15 free-float hand guards.
• Functions as an AR-15 barrel nut, threading onto the barrel extension to secure the hand guard mounting interface.
• Manufactured by CMMG to the company’s own free-float hand guard tolerances for a correct factory fit.

Frequently Asked Questions

Will a generic mil-spec barrel nut work instead? This barrel nut is machined specifically for CMMG free-float hand guards, so it’s the correct choice for a proper fit with that system.

What does a barrel nut do? It threads onto the barrel extension and locks the hand guard’s mounting interface to the upper receiver.

Who makes this barrel nut? CMMG, built to pair with its own free-float hand guard line.

Buy the CMMG AR-15 Barrel Nut for Free Float Handguards

Get the correctly toleranced barrel nut for your CMMG free-float build instead of guessing with a generic part. Order it from our CMMG lineup, part of our AR upper parts selection, at our Lubbock, Texas gun shop for fast, direct shipping.