Description: 6-position receiver extension tube Mil-spec diameter for AR15 rifles Precision machined from 6061/T6 aircraft grade aluminum Matte black anodizing with mil-spec, type III hardcoat, Class II Tight tolerance control for zero-gap fit with polymer stock and receiver to meet demanding silent operations Made in USA Aluminum 4 oz Black Broken extension tube on your AR15' This 6-position UTG receiver extension tube is precision machined from 6061/T6 aircraft grade aluminum and is a direct replacement for AR15 rifles. The extension tube has a matte black anodized finish and is made with tight tolerance control for a zero-gap fit with polymer stocks and receivers. Made in USA, black.

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