TacFire MAR040 Mil-Spec AR-15 Buffer Tube - Black Hardcoat Anodized Aluminum

The TacFire MAR040 Mil-Spec AR-15 buffer tube is a precision-engineered receiver extension built to tight tolerances for reliable, repeatable performance in any AR platform. Whether you're running a quiet, suppressed build or a precision rifle, this buffer tube provides the hard-wearing durability you need from a foundational component—no wobble, no rattle, no surprises when rounds downrange matter.

Built from 6061-T6 aircraft-grade aluminum and finished with Type III Class II hard coat anodizing, the TacFire MAR040 resists wear, salt exposure, and the daily abuse of field use better than standard anodize. The zero-gap fitment between tube and receiver, plus compatibility with Mil-Spec stocks, means your completed assembly will be tight and stable. That precision fit is especially valuable in suppressed or hearing-protection builds where vibration control contributes to consistency and shooter control.

TacFire's tight tolerance control makes this tube a no-fuss choice whether you're building a duty rifle, precision semi-auto, or a dialed-in hunting platform. Pair it with your choice of Mil-Spec buffer spring and weight, then lock in your stock—this is the kind of part that disappears into a solid gun and lets everything else do its job.

Key Features

• 6061-T6 aircraft-grade aluminum construction for strength and lightweight performance
• Type III Class II hard coat anodizing for superior wear and corrosion resistance
• Tightest tolerance control for zero-gap fitment with receiver and stock
• Mil-Spec compatible with standard AR-15 buffer stocks and springs
• Black hardcoat anodized finish

Specifications

Frequently Asked Questions

Is this buffer tube compatible with Mil-Spec AR-15 stocks?

Yes. The TacFire MAR040 is designed to work with standard Mil-Spec AR-15 butt stocks and is built to Mil-Spec dimensions.

What makes the hard coat anodizing better than standard anodize?

Type III Class II hard coat anodizing is thicker and denser than standard (Type II) anodize, offering superior resistance to wear, scratching, and corrosion. It's the finish choice for serious field rifles.

Will this buffer tube fit my AR-15 lower receiver?

The TacFire MAR040 is engineered to Mil-Spec tolerances and designed for zero-gap fitment with AR-15 receivers and stocks that meet Mil-Spec dimensions. Always verify your lower receiver is Mil-Spec before purchasing.

Can I use this tube with any buffer spring and weight?

Yes, the MAR040 is compatible with Mil-Spec buffer springs and weights. Consult your build specifications or the manufacturer of your chosen spring and buffer to confirm the right combination for your intended use.