Guntec USA AR-15 Wide Castle Nut Extreme Duty - Steel Black Nitride

The Guntec USA AR-15 Wide Castle Nut is a heavy-duty, US-made steel castle nut purpose-built to lock down a carbine or M4 buffer tube on an AR-15 lower receiver. The extreme duty wide-body geometry gives builders extra contact surface and added strength over a standard castle nut, making it a smart upgrade for hard-use carbines and any rifle that sees a lot of abuse.

Machined from steel and treated with a corrosion-resistant nitride finish in matte black, this castle nut is built to resist wear and the elements. The wide profile seats solidly against the buffer tube flange for a more secure lockup under recoil, and the nut is compatible with both mil-spec and commercial-spec M4/carbine buffer tubes.

Installation is straightforward with any standard castle-nut wrench or AR-15 armorer's wrench. Whether you are assembling a new build, replacing a worn OEM nut, or stepping up a workhorse carbine, this Made in USA castle nut delivers the strength and fit a serious AR-15 build demands.