The CMMG Mil-Spec AR-15 Barrel Nut (CMMG part no. 55DA296) is the standard barrel nut for an AR-15 upper. CMMG makes it to the mil-spec pattern, so it is the nut to use when you are building or rebuilding an upper. It holds the barrel to the upper receiver and sets up the handguard mounting. It is a small part, but every AR-15 upper needs one.

Key Specifications

• The part is a barrel nut, the threaded ring that retains the barrel in the upper receiver.
• The pattern is mil-spec, the common standard for AR-15 uppers.
• It is made for the AR-15, as CMMG names it.

Frequently Asked Questions

What does a barrel nut do? It threads onto the upper receiver and locks the barrel in place.

Is this the mil-spec pattern? Yes. CMMG names it the Mil-Spec AR-15 Barrel Nut.

Buy the CMMG Mil-Spec AR-15 Barrel Nut

A fresh barrel nut is a cheap part to have on hand for an upper build. See more small AR-15 parts from CMMG. Order from our Lubbock, Texas gun shop for fast, direct shipping.