The TacFire Mil-Spec AR-15 Buffer Tube (brand part no. MAR040) is a receiver extension machined from 6061-T6 aircraft grade aluminum and finished in matte black Type III Class II hard coat anodizing for maximum wear resistance. TacFire holds this tube to tight tolerance control, delivering a zero-gap fit against your polymer stock and receiver for the quiet, rattle-free operation that matters in demanding conditions. Built to mil-spec dimensions, it drops in as a direct fit for any mil-spec collapsible buttstock, whether you are finishing a new build or replacing a damaged tube.

Key Specifications

• Machined from 6061-T6 aircraft grade aluminum for strength and durability.
• Finished with Type III Class II hard coat anodizing in matte black for maximum wear resistance.
• Held to tight tolerance control for a zero-gap fit against polymer stocks and receivers.
• Built to mil-spec dimensions for compatibility with standard mil-spec buttstocks.
• Weighs approximately 3.9 oz, keeping it lightweight for easy carry.

Frequently Asked Questions

Will this fit my mil-spec stock? Yes, it is built to mil-spec dimensions and is compatible with mil-spec collapsible buttstocks.

Why does tolerance control matter here? A zero-gap fit against the stock and receiver eliminates the rattle and play that loose-tolerance tubes develop over time.

Buy the TacFire Mil-Spec AR-15 Buffer Tube, Aluminum, Black

A sloppy buffer tube fit shows up as stock wobble and unwanted noise, and this hard-anodized TacFire tube is machined tight enough to eliminate both. It is a straightforward upgrade or replacement for any mil-spec build. Shop more TacFire gear or browse our AR buffer systems selection, and order it from our Lubbock, Texas gun shop for fast, direct-to-you shipping.