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The gas tube is one of those small parts that does a big job. On a rifle-length AR-15, it carries the gas tapped off your barrel back to the bolt carrier key, and that pulse of pressure is what cycles your action shot after shot. Luth-AR's BL-04 is the rifle-length version of that part, measuring 15 3/16 inches overall to line up with the longer gas systems found on 18 to 20 inch barrels.
This one is machined from 304 stainless steel and given an Army-spec heat treatment, which is the same recipe used on quality mil-style tubes. Stainless holds up well against the heat and corrosion that come with a hard-working gas system, and the treatment helps the tube keep its shape under repeated thermal cycling. It's made in the USA and carries a bare stainless finish, so it looks the part on a retro or period-correct build too.
The BL-04 uses the standard OEM footprint, so it drops into a rifle-length gas block and pins in place with a small roll pin. When you install it, the gas port hole on the tube faces down toward the barrel and the roll pin hole lines up with the matching hole in your gas block. A quick tip from the bench: run your bolt carrier into the upper after install to confirm the tube slides cleanly into the gas key without binding. Get the alignment right and this thing will run trouble-free.
Whether you're bringing an older rifle back to life or piecing together a fresh 20 inch upper, the BL-04 is a straightforward, dependable choice. It's the kind of part you install once and forget about, which is exactly what you want from a gas tube.
Rifle-length gas systems are typically found on 18 to 20 inch AR-15 barrels. The 15 3/16 inch length of the BL-04 is sized to reach from a rifle-length gas block back to the upper receiver. Always match your tube length to your barrel's gas port location before ordering.
Yes. It's machined from 304 stainless steel and given an Army-spec heat treatment. Stainless resists the heat and corrosion that build up in a gas system, and it's a common choice for durable, long-lasting tubes.
It slides into the rear of a rifle-length gas block with the gas port hole facing down toward the barrel, then locks in with a small roll pin driven through the aligned holes. A roll pin punch makes the job cleaner and avoids marring the finish. After install, cycle your bolt carrier by hand to make sure the tube enters the gas key without binding.
It uses the standard OEM footprint, so it serves as a direct replacement for a worn or damaged rifle-length tube as well as a component for a new upper build. If your old tube is carbon-caked or bent, swapping in a fresh one is cheap insurance for reliable cycling.
| UPC | 859819007652 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BL-04 |
| Model | |
| Product Type | Gas Tube |
| Length | 15 3/16 |
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