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Building or refreshing an AR-15 with a CMMG RKM handguard? The 55DA244 is the piece that makes it all come together. This is the factory barrel nut CMMG designed for its Revo KeyMod free-float rails, machined from durable steel with a black finish so it holds up to the heat and abuse that lives right behind the gas block. It threads onto a standard mil-spec upper receiver and gives your handguard a solid, repeatable place to clamp down.
On a free-float setup, the barrel nut carries the weight of the entire handguard while keeping it off the barrel itself. That gap matters. With nothing touching the barrel, your rail can take the load of a bipod, sling, or grip without pulling on the tube behind your groups. The 55DA244 is internally threaded and knurled around the outside, which gives the RKM rail a clean surface to index against and mount up straight.
One of the nicer things about this design is the tooling. Instead of chasing down a proprietary wrench, this barrel nut installs with a standard receiver extension castle nut wrench, the same kind of tool most folks already have in the toolbox from stock work. That keeps the RKM install about as painless as free-float rails get. A little anti-seize on the receiver threads and proper torque, and you are set. If you are not comfortable turning your own wrenches on the upper, this is an easy one to hand off to a gunsmith.
Since this is the real CMMG part and not a generic substitute, you get the fit the RKM rails were engineered around. It works across the AR-15 platform for common chamberings like .223 Rem, 5.56x45mm, and .300 Blackout, and like the rest of the CMMG lineup it carries the company's lifetime quality guarantee. If you cracked or stripped an old nut during a swap, or you picked up an RKM rail that came up short a barrel nut, this is the exact replacement to grab.
This barrel nut is made specifically for CMMG's RKM (Revo KeyMod) free-float handguards on the AR-15 platform. It threads onto a standard mil-spec upper receiver and gives the RKM rail its mounting interface. If you are running a CMMG RKM rail, this is the nut it was designed around.
It installs with a standard receiver extension castle nut wrench, the same tool used for buffer tube castle nuts. That means you likely already have what you need rather than hunting for a proprietary wrench. Add a torque wrench and some anti-seize on the receiver threads for a proper install.
Yes, this is the factory original CMMG barrel nut, not a generic aftermarket copy. Because it is the real part, you get the exact fitment the RKM handguards were engineered for. It is also backed by CMMG's lifetime quality guarantee.
It fits standard mil-spec AR-15 upper receivers and pairs with the CMMG RKM handguard system. It works across common AR-15 chamberings including .223 Rem, 5.56x45mm, and .300 Blackout. It is intended for the RKM rails rather than as a universal drop-in for every free-float brand.
| UPC | 815835017358 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 55DA244 |
| Model |
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