AR-15 Receiver Extension Castle Nut
- STAR15-4040 1
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This mil-spec AR-15 receiver extension nut (castle nut) is for use on M4 style receiver extension tubes.
The CMMG AR15 Carbine Receiver Extension Kit includes a CMMG 6-position receiver extension, carbine buffer assembly, and a carbine action spring. Use the AR15 Carbine Receiver Extension Kit with your...
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