Mil-spec. receiver extension lock nut (castle nut) for use on AR15 carbines with an adjustable stock. Perfect for your new build or as a direct replacement for worn out parts. Made in the USA.
Features
- Mil-spec. receiver extension lock nut (castle nut) for use on AR15 carbines with an adjustable stock
- Perfect for new build or as a direct replacement for worn out parts
- Made in the USA
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