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The gas tube is one of those small parts that carries a big job. It's the thin channel that routes hot gas from the gas block back to the bolt carrier key, and without it your AR-15 doesn't cycle. Luth-AR builds this carbine-length version out of 304 stainless steel, which shrugs off the corrosion and heat that eat away at cheaper tubes over long strings of fire. At 9 3/4 inches overall, it's cut to spec for a standard carbine-length gas system, the setup you'll find on most 16-inch AR-15 barrels.
Stainless steel is the story here. It handles the repeated heat cycles better than plain steel and stays dimensionally stable, which matters when you're relying on the tube to seat cleanly into the gas key round after round. Luth-AR also runs an army spec heat treatment on these tubes, so the stainless holds up under the pressure and temperature swings of real shooting rather than just looking good on the bench. Builders tend to notice the fit and finish first, clean holes that line up right, no burrs, and a tube that drops into the block without a fight.
This is a carbine-length tube, so make sure your barrel uses a carbine gas system before you order. It measures out to the standard 9 3/4 inch overall length and installs in-line the same way any mil-spec carbine tube does, pinned into the gas block with a 5/64 roll pin and slid into the upper so it engages the carrier key. If you're swapping a worn tube or finishing a fresh upper, a gas tube alignment tool and a proper roll pin punch make the job painless. It works with low-profile gas blocks and front sight bases alike.
Made in the USA and backed by Luth-AR's one-year warranty against defects in material and workmanship, this is a straightforward, dependable replacement or upgrade for anyone running a carbine-length AR-15.
It fits AR-15 barrels set up for a carbine-length gas system, which covers most 16-inch carbine builds. The tube is cut to the standard 9 3/4 inch overall length. Just confirm your barrel is carbine gas and not mid-length, pistol, or rifle before ordering, since those all use different tube lengths.
The listing covers the gas tube itself. Gas tubes install with a 5/64 roll pin that pins the tube into the gas block, so if you don't already have one on hand, pick up a roll pin to complete the job. Many builders keep a small pack of them around for exactly this reason.
304 stainless resists corrosion and handles the repeated heat cycles of an AR gas system without breaking down. It also stays dimensionally stable, which helps the tube seat cleanly into the bolt carrier key over the long haul. Luth-AR adds an army spec heat treatment for extra durability under real-world use.
Yes, Luth-AR manufactures these gas tubes in the USA. They're also backed by a one-year warranty against defects in materials and workmanship, so you're covered if anything goes wrong out of the gate.
| UPC | 859819007669 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BL-04A |
| Model | |
| Product Type | Gas Tube |
| Length | 9 3/4 |
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