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The gas tube is one of those small parts that quietly makes or breaks your build, and the One Horse OH-GT03 handles that job without drama. It routes gas from the block back to the upper receiver so your bolt carrier gets the pressure it needs to cycle every round. If you're setting up a mid-length gas system, this is the tube that ties everything together between your barrel's gas port and the carrier key.
Mid-length gas systems are the sweet spot for a lot of 16-inch AR-15 barrels. The extra distance between the gas port and the chamber compared to a carbine setup gives you a lower, more even pressure curve, which usually means less felt recoil and a gentler cycle on your internals. The OH-GT03 is sized for that mid-length layout, so it's a natural match for barrels spec'd with a mid-length gas port and a handguard long enough to cover the tube.
One Horse builds their AR parts stateside and keeps the lineup focused on dependable, no-nonsense components for people putting together their own rifles. The OH-GT03 follows standard mid-length dimensions, so it drops into a typical build the same way any quality mid-length tube would. It plays nice with .750 low-profile gas blocks and works across the common calibers you'd run on the platform.
Swapping in a gas tube is a straightforward bench job if you've got the right punches. You'll seat the tube into the gas block and drive the roll pin through to lock it in place, then slide the front end into the receiver as you reassemble the upper. A roll pin starter punch makes life a lot easier here since it holds the pin steady before you commit with a finishing punch. Whether you're chasing down a worn tube on an older rifle or starting a fresh build from a pile of parts, the OH-GT03 gets your gas system squared away.
Mid-length gas systems are most common on 16-inch AR-15 barrels, though they generally cover the 14 to 20 inch range. The key thing is that your barrel has to be drilled for a mid-length gas port, not carbine or rifle. Check your barrel's spec sheet before ordering so the tube lines up with the gas port and your handguard length.
Yes, the gas tube ships with the roll pin you need to secure it to your gas block. That's the standard setup for a mid-length tube and gets you ready to install without hunting down extra hardware.
It will. The OH-GT03 is built to standard mid-length dimensions, so it pairs with the common .750 low-profile gas blocks most builders run. As long as your block and barrel are both set up for mid-length, you're good to go.
It's a manageable job for anyone comfortable working on their upper. You seat the tube into the gas block, drive the roll pin through, then reassemble the upper. A roll pin starter punch makes the process a lot smoother by holding the pin in place before you finish driving it.
| UPC | 850078799234 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | OHGT03 |
| Length | 2'' |
| Shipping Weight | 0.064 |
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