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AR-15 Carbine Extension Tube Castle Nut


The A*B Arms Receiver Extension is an aluminum buffer tube used as an accessory for AR15s, as well as the various MOD*X chassis receivers and butt stock adapters.

SKU: ABACN Category:

Description – ABACN (Castle Nut)

Mil-Spec Castle Nut secures the buffer tube/receiver extension to the MOD*X chassis, AR15, and AR10 platforms.

  • Phosphate coated
  • You know what it is
  • You know what it does
  • You know you want one


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