Description
The gas tube is one of those small parts that quietly makes or breaks how your AR runs, and Spikes Tactical didn't cut any corners here. This rifle-length tube measures right around 15 1/8 inches, which is the length you want for barrels in the 18 to 20 inch range running a rifle-length gas system. It's machined from Mil-Spec 304 stainless steel, then treated with a Melonite finish that boosts heat resistance, guards against corrosion, and cuts down on glare so it stays out of sight under your handguard.
What Sets This Spikes Tactical Gas Tube Apart
Melonite isn't just a black coating for looks. The nitride treatment hardens the surface and helps the tube shrug off rust and heat buildup, which matters when you're running long strings or shooting older corrosive surplus ammo. That corrosion resistance makes it a smart pick for 5.45 uppers as well as your standard .223/5.56 builds. The finish also keeps things low-reflection, a detail hunters and anyone running a subdued rifle will appreciate.
Same Tube Spikes Runs in Their Own Rifles
This is the exact gas tube Spikes Tactical installs on their ST-15 rifles and every one of their complete upper receivers. That's worth pointing out because it means you're not settling for a bargain part to finish your build. You're getting the same component the factory trusts, and it's backed by the Spikes lifetime warranty.
Installing the Rifle-Length Gas Tube
Each tube ships with a stainless steel split roll pin, so you've got what you need to pin it into your gas block. The whole thing weighs in at just under an ounce, so it won't add anything noticeable up front. If you're swapping out an old tube or building fresh, just double-check that your barrel is set up for a rifle-length system before ordering, since gas tube length has to match your gas port location for the rifle to cycle right.
Key Specifications
- Manufacturer: Spikes Tactical
- Manufacturer Part Number: SUGT0M4
- UPC: 855319005921
- Product Type: Gas Tube
- Gas System Length: Rifle-Length
- Length: 15 1/8 in
- Material: Mil-Spec 304 Stainless Steel
- Finish: Melonite (Nitride)
- Color: Black
- Weight: 0.96 oz
- Fitment: AR-15 / AR-10 rifle-length gas systems
- Made In: USA
What’s Included
- 1x Spikes Tactical rifle-length Melonite gas tube
- 1x stainless steel split roll pin
Frequently Asked Questions
What barrel length does this rifle-length gas tube work with?
A rifle-length gas tube is meant for barrels in the 18 to 20 inch range that are set up with a rifle-length gas port. If your barrel was drilled for a carbine or mid-length system, this tube won't line up correctly. When in doubt, measure from your gas port to the chamber end of the barrel to confirm you need the rifle-length setup.
Does the Spikes Tactical gas tube come with a roll pin?
Yes. Every tube ships with a stainless steel split roll pin so you can pin it into your gas block right away. You won't need to source that hardware separately.
What's the benefit of the Melonite finish over a plain stainless tube?
The Melonite treatment hardens the surface for better heat and corrosion resistance and cuts down on glare. That extra corrosion protection makes it a solid choice if you shoot older surplus or corrosive ammo, and the low-reflection finish keeps it discreet under a handguard.
Is this the same gas tube Spikes uses in their factory rifles?
It is. This is the exact tube Spikes Tactical installs on their ST-15 rifles and all of their complete upper receivers. It's also covered by the Spikes lifetime warranty.





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