AR-15 castle nuts are used to secure the buffer tube to the lower receiver on compatible AR-15 platforms, helping keep the stock or brace assembly properly installed and stable during use. They play an important role in maintaining the fit and function of the rear receiver setup during builds, repairs, and upgrades. Different castle nuts can vary in finish, staking surfaces, and compatibility depending on the rifle configuration. This category includes AR-15 castle nuts built for proper fit, dependable function, and practical everyday performance.
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JE Machine Tech AR-15 Mil-Spec Castle Nut Black
JE MACHINE TECH$3.99This mil-spec castle nut is designed to secure a compatible carbine buffer tube or receiver extension to an AR-15 lower receiver. It is suitable for new firearm builds, replacement projects, repairs, and routine maintenance involving compatible AR-15...
