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Hi Stephen, the length is 7.3" Our 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. Stay safe & have a great day!

Hi Stephen and welcome. This buffer tube is 7.25" in length and has an outside diameter of 1.148". Cheers, stay safe and enjoy!