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The CMMG 55DA296 is the small part that does a big job. It threads onto the barrel extension and clamps everything tight to your AR-15 upper receiver, giving your barrel the rock-solid foundation it needs to stay square and shoot straight. CMMG cut this one to mil-spec dimensions, so it plays nice with standard delta ring assemblies and the drop-in handguards built around a mil-spec nut.
This nut is machined from steel and finished in black nitride, which is a big reason it holds up to repeated torquing without galling or wearing out. The threading is internal and cut to the same standard the AR platform was built around, so it lines up with carbine, mid-length, and rifle-length setups without any fuss. Builders who've run these tend to point out the fit and finish first: clean machining, no pitting, and a consistent feel when you torque it down.
A barrel nut is one of those parts where mil-spec really matters. Because CMMG holds tight tolerances here, it seats properly against the receiver face and gives you the clamping force you need to hit the recommended torque range. If you're running a standard front sight base and delta ring handguard, this nut has the groove and threading to work with a delta ring assembly. Just note that some free-float rail systems use a proprietary nut, so double-check that your handguard is built for a mil-spec nut before you order.
Whether you're assembling your first upper on the bench or keeping a shop stocked for repairs, this is the kind of no-drama component you want on hand. CMMG has a long track record making dependable AR parts out of Missouri, and this barrel nut carries that same reputation. Pair it with a proper armorer's wrench and a vise block, add a little grease to the threads, and you're set to torque your barrel in place.
Yes, this barrel nut is cut to mil-spec dimensions and internally threaded to the AR-15 standard. That means it works with standard delta ring assemblies and the many drop-in handguards designed around a mil-spec nut. Just remember that some free-float rails use their own proprietary nut, so confirm your handguard calls for a mil-spec nut before installing.
CMMG builds this one from steel with a black nitride finish. That combination stands up well to the repeated torque a barrel nut sees and resists wear over the long haul. It's a big part of why builders like the consistent fit and clean machining.
You'll want an AR-15 armorer's wrench, a receiver vise block, and a torque wrench to seat it correctly. Adding a little grease to the threads before you torque it down helps you reach the proper torque spec and makes future removal easier. Taking your time to align the gas tube hole is the main thing to watch on install.
It fits standard AR-15 uppers running carbine, mid-length, or rifle-length configurations, and it pairs with delta ring and drop-in handguard assemblies built for a mil-spec nut. Free-float rail systems that ship with their own barrel nut won't use this part. When in doubt, check what type of nut your specific handguard requires.
| UPC | 815835012711 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 55DA296 |
| Color | BARREL NUT |
| Length | 4.7500 |
| Model | |
| Product Type | Barrel Nut |
| Shipping Weight | 0.095 |
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