$11.99
116 in stock
Online inventory may differ from in-store availability.
Quick turnaround so you get your gear sooner.
Trusted checkout with industry-standard protection.
Keeping Traditions Alive Since 1953
Secure Transactions provided with 
The Luth-AR BL-04B handles one of the most important jobs on your short-barrel AR: routing hot gas from the gas block back to the bolt carrier group so the rifle cycles the way it should. It's machined from 304 stainless steel with an Army-spec heat treatment and runs 6 11/16 inches from end to end, which is the correct length for a pistol-length gas system. Stainless holds up well against the heat and fouling that come with tapping gas so close to the chamber, and that shiny finish is easy to wipe down when it's time to clean.
Pistol-length gas is the shortest of the four common systems, and it earns its keep on the little guns. You'll typically see it on barrels around 10.5 inches and shorter where there simply isn't room for a longer setup. It's also the go-to for a lot of 300 Blackout builds, even on longer barrels, because the short dwell time and higher pressure help those rounds cycle reliably, subsonic loads included. Before you order, double-check what your barrel calls for since gas port location is what actually determines the right tube length.
Whether you're piecing together a fresh upper or swapping out a tube that's seen better days, this is a straightforward, no-drama part. It seats into a low-profile gas block and Luth-AR includes the roll pin so you're not making a second trip for hardware. Installation is simple with the right punch and a vise block, and the OEM-style dimensions mean it lines up with standard pistol-length components without any fuss.
Luth-AR has built a solid reputation among AR builders for turning out dependable, American-made parts, and this gas tube fits that mold. It's the kind of component you install once and forget about, which is exactly what you want from something buried inside your handguard.
Pistol-length gas systems are generally used on barrels around 10.5 inches and shorter where there isn't room for a carbine or longer setup. That said, gas port placement on your specific barrel is what determines the correct tube, so check your barrel's specs before ordering. Many 300 Blackout builds also run pistol-length gas even on longer barrels for better cycling.
Yes, Luth-AR includes the gas tube roll pin needed to pin the tube into a low-profile gas block. You won't need to source separate hardware to complete the install. You'll just want a proper roll pin punch and a way to support the block during assembly.
The BL-04B is machined from 304 stainless steel and gets an Army-spec heat treatment. Stainless is a smart choice for a pistol-length system since the gas is tapped close to the chamber, which means more heat and fouling. It also cleans up easily and resists corrosion over the long haul.
It's a great fit for 300 BLK. That caliber tends to run best on a pistol-length gas system regardless of barrel length because of how the powder burns, and pistol gas helps it cycle reliably with both supersonic and subsonic loads. This 6 11/16-inch tube is the right length for that job.
| UPC | 859819007676 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BL-04B |
| Model | |
| Product Type | Gas Tube |
You must be logged in to post a review.
Reviews
There are no reviews yet.