ATI AR-15 Steel Castle Nut Universal Receiver

Advanced Technology
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These steel castle nuts from Advanced Technology are a great way to finish off your carbine. The universal design works well with all available buffer tubes, and the four notches give you plenty of options for tightening it down.

Specifications and Features:
Manufacturer Number: A.5.10.1020
Steel castle nut
Works with commercial, military and hybrid buffer tubes
Virtually indestructible
Manufactured in the USA
Limited lifetime warranty