This AR-15 barrel nut for sale delivers a rock-solid lockup between your barrel and upper receiver. This Mil-Spec barrel nut is a replacement part machined from heavy-duty steel and finished with a military-grade manganese phosphate coating. This AR-15 barrel nut provides exceptional durability alongside maximum corrosion resistance. Whether you are assembling an M4 build, completing a quick repair, or installing a performance upgrade, this standard steel barrel nut is built to last and comes backed by a limited lifetime warranty.
Because barrel nut fitment is determined entirely by the receiver's threads, the Mil-Spec thread pitch is a standard 1-3/16" x 16 TPI. This barrel nut accommodates multiple calibers—including 5.56 NATO, .223 Rem, .300 Blackout, 6.5 Grendel, 9mm, etc.—regardless of what the barrel itself is chambered for, as long as it is a (standard small-frame) Mil-Spec AR-15/M4 style. Does NOT Fit: AR-10, LR-308, or large-frame platforms.
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