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The gas tube is one of those small parts that quietly does a huge amount of work. Every time you touch off a round, gas gets tapped from the barrel, routed through the gas block, and pushed back through this tube to run the bolt carrier group. Get the length wrong and the gun won't cycle right. This one from DoubleStar is a pistol-length tube, the shortest of the four standard sizes, and it's the correct piece for AR pistols and short-barreled builds where the gas port sits close to the chamber.
Pistol-length gas systems live on the shortest AR builds, generally barrels around 10 inches or less. This tube measures 6 3/4 inches, the standard spec for a pistol-length system, and it's cut to work with barrels running roughly 6 1/4 to 7 1/2 inches. It also makes a useful stand-in on those really stubby carbine barrels where a full carbine-length tube just won't clear. On a short barrel the dwell time is compressed, so matching the tube to the gas port location is what keeps the action running instead of short-stroking.
DoubleStar machines this tube from stainless steel with a natural finish. Gas tubes take a beating from heat and carbon fouling every time you shoot, and stainless holds up well to that repeated thermal cycling without needing a coating to protect it. It's a proven material choice for a part that sees this kind of abuse, and the bare finish means there's nothing to wear off over time.
Installation is straightforward if you've done gas block work before. The tube pins into the gas block and feeds into the upper receiver through the barrel nut, so alignment between the block, tube, and receiver is what matters most. If you're assembling or repairing a pistol-length upper and need the right gas tube to bring it all together, this is the part that does the job. Made in the USA by DoubleStar, a name that's been building AR components for years.
It's built for pistol-length gas systems, which typically run on AR barrels around 10 inches or shorter. DoubleStar cuts this tube to fit currently available pistol barrels in the 6 1/4 to 7 1/2 inch range. It can also fill in on very short carbine barrels where a standard carbine tube would be too long.
It measures 6 3/4 inches, which is the standard length for a pistol-length gas system. Matching that length to your barrel's gas port location is what keeps the action cycling correctly. Run the wrong length and the gun won't function the way it should.
Gas tubes deal with a lot of heat and carbon fouling, and stainless steel handles that repeated thermal cycling well on its own. The natural finish means there's no coating to burn off or wear away over time. It's a durable, no-nonsense material choice for a part that gets worked hard.
If you've done gas block work before it's a manageable job. The tube pins into the gas block and feeds through the barrel nut into the upper receiver, so getting the alignment right between those parts is the key. A first-time builder will want the correct roll pin and a bench setup to make it clean.
| UPC | 841348100423 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | AR412P |
| Length | 6 3/4 |
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