【Hunter Select】AR-15 Castle Nut for Carbine Receiver Extension Buffer Tube #00228
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AR-15 Receiver Extension Buffer Tube Lock Ring Mil-Spec Carbine Castle Nut. This Hunter Select Us castle nut secures your carbine buffer tube to your AR-15 lower receiver. It is made in the U.S.A. from hardened steel for the durability and strength you'd expect. The narrower staking cuts allow the end plate to be staked into the castle nut for a worry-free installation.
● Steel castle nut
● Easy installation
● Works with commercial and mil-spec buffer tubes
● Notches provides plenty of options for tightening