Battle Arms Development's AR15/M16 Mil-Spec Barrel Nut is a high quality component that will provide excellent fit and reliable function in your AR series rifle and is perfect for upgrading existing components or replacing worn or broken parts. A necessary part for those who are into building barrels, the barrel nut is assembled onto the barrel before the barrel extension is torqued onto the barrel and forms the crucial link between barrel assembly and upper receiver.

Specifications:
Machined from High Quality Steel
Black Manganese Phosphate.