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Compare to our GunBroker listing:TACFIRE MAR040
This AR15 Mil-Spec buffer tube is made from 6061-T6 Aircraft Grade Aluminum Matte Black Anodizing with Type III Class II Hard Coat for Best Wear Resistance. It has the tightest tolerance control for Zero-gap fitment with Polymer stock and receiver to meet most demanding silent operations. Compatible with Mil-Spec butt stock.