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Mil-Spec M4 carbine buffer tube castle nut for AR15 rifles, chassis stocks or other rifles which accept AR furniture such as MDT stocks, Ruger Precision rifle, etc.


Additional items you may need for your installation can be found in the accessories section on this page.

    M4 Mil-Spec receiver extension castle nut

    VAT Included
    • Fits:


      • Mil-spec diameter 1.148” buffer tube
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