Product Description The TacFire MAR040 Mil-Spec buffer tube is a durable AR-15 receiver extension built from 6061-T6 aircraft-grade aluminum and finished in matte black Type III Class II hardcoat anodizing for excellent wear resistance. Designed with tight tolerance control, it delivers a zero-gap fit with compatible polymer stocks and the receiver for smooth, quiet operation. This Mil-Spec tube is compatible with Mil-Spec buttstocks, making it a dependable choice for upgrades, replacements, and AR-15 builds. Product Highlights 6061-T6 aircraft-grade aluminum construction for strength and long service life Matte black Type III Class II hardcoat anodized finish for enhanced wear resistance Mil-Spec dimensions for compatibility with Mil-Spec adjustable buttstocks Tight tolerance control designed to help achieve a zero-gap fit for quieter operation Ideal AR-15 buffer tube replacement/upgrade for stock and receiver extension assemblies Specs Brand: TacFire Manufacturer Part Number: MAR040 UPC: 811261021921 Platform/Fit: AR-15 Specification: Mil-Spec Material: 6061-T6 aluminum Finish/Color: Matte black anodized, Type III Class II hard coat Overall Length: 7.3 in Net Weight: 3.6 oz Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.