TacFire AR15 Mil-Spec Buffer Tube - TacFire's 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. Length: 7.3" Net Weight: 3.6 oz. Color: Black