Aluminum Castle Nut
1Lightweight aluminum castle nut, hard coat anodized.
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Our aluminum AR15 receiver extension nut (castle nut) is a lightweight option for your next rifle or pistol build! Weighing less than an ounce, our castle nut is an easy upgrade over a milspec castle nut with a parkerized finish.
We recommend using Loctite® Threadlocker Blue 242 on the threads during installation to prevent the nut from loosening during use.
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