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AR15 Receiver Extension Castle Nut – Nitride
AR15 Receiver Extension Castle Nut – Nitride
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AR15 Receiver Extension Castle Nut – Nitride

Hickory Flat Boars
$5.50 USD
$5.50 USD
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This is our standard AR-15 Mil-Spec carbine buffer tube/receiver extension castle nut. 

  • 4140 tool steel construction
  • Phosphate finish
  • Fit: AR-15 or LR308 buffer tubes