Sully Gas Tube Vice Jaws

Sully Gas Tube Vise Jaws Instructions


The Sully Gas Tube Vise Jaws are designed for removal & installation of gas tubes on AR15 & AR308 type weapons systems. Often times gas tubes can get stuck inside of gas blocks & front sight bases from use, where the carbon builds up causing the gas tube to get bound up.

To remove a stuck gas tube, you will need these recommended tools & follow these directions:

Tools: Sully Gas Tube Vise Jaws, 5/64” Pin Punch, Kroil Creeping Oil, Armorer Bench Block, and a good Bench Vise. A 4” Bench Vise is a good size, as it allows you just enough space to clamp onto carbine length gas tubes (6”-8” vises may be too wide on carbine length gas tubes)

1. Remove the gas tube roll pin. Most gas tube roll pins are 5/64” in diameter, so we recommend using a 5/64” punch, small ballpein hammer, and a few drops of Kroil creeping oil, and a bench vise. Note: If no bench vise is available due to field conditions, a good set of vise grips or possibly a C-clamp could be a good substitute in a pinch. First add a few drops of Kroil to both sides of the roll pin where it is inserted in the gas block or front sight base. Next brace the gas block or front sight base on an armorer bench block. Place the tip of the 5/64” punch onto the roll pin, and tap the punch carefully with the ballpein hammer to remove the roll pin. Once the roll pin is removed, you are ready to remove the gas tube from the gas block or front sight base.
2. Place the Sully Gas Tube Vise Jaws around the gas tube, approximately 1” behind the front sight base or gas block.
3. Now put the Sully Gas Tube Vise Jaws with the inserted gas tube, into a bench vise. Lower the Sully Gas Tube Vise Jaws as low as you can, getting them as close to level with the top of the bench vise jaws as possible. Now tighten the bench vise until everything is clamped up firmly, so the bench vise jaws now obtain a solid firm hold on the gas tube so it doesn’t slip around.
4. With the gas tube firmly clamped into a bench vise, try to carefully rotate the assembly each direction, trying to get the gas tube to rotate inside of the gas block or front sight base. If you can get it to rotate, then keep rotating while you push the assembly forward and the gas tube comes out of the front sight base or gas block.
5. If the gas tube is carboned up the point that nothing can be rotated, try applying some heat with a propane or butane torch, which the heat will help expand the tolerances and soften the carbon build up, and at the same time keep applying a little rotation pressure until you can get the gas tube to rotate to one side or the other. Once you can get the gas tube to rotate inside of the front sight base or gas block, add some Kroil inside the roll pin hole, then rotate the gas tube to the other side and apply more Kroil to the other side roll pin hole. Next carefully rotate the gas tube back/forth to work the Kroil into the carbon fouling, until things get loosened up. then keep rotating while you push the assembly forward and the gas tube comes out of the front sight base or gas block.
6. If you can freely rotate the gas tube inside of the gas block or front sight base, but it still will not allow you to pull the gas tube out, then you can place an armorer bench block at the back of the upper receiver, and carefully use a ballpein hammer to tap on the armorer bench block to help shift the gas tube out of the gas block or front sight base.

Tools Needed: Sully Gas Tube Jaws, Armorer Bench Block, Bench Vise, 3/32” Roll Pin Punch, Gun Lube, and we also recommend a 1/16” Pin Punch to be used to ensure that the gas roll pin hole is properly aligned with the roll pin hole in the gas block or front sight base.

1. Insert the roll pin hole end of the gas tube into the front sight base or gas block as far as you can.
2. Place the Sully Gas Tube Vise Jaws around the gas tube, about 2”-3” back from the front end of the gas tube (The front end is the gas ported / roll pin hole end of the gas tube).
3. Place the Sully Gas Tube Vise Jaws with the gas tube inserted, into the jaws of a bench vise. (Note: In the field where a bench vise is not available, you could possibly use a set of vise grips instead).
4. With the assembly firmly clamped into a bench vise, gently rotate and push the gas tube into the front sight base or gas block, and visually watch through the roll pin hole until the roll pin holes of the gas tube and front sight base or gas block properly align with each other.
5. Once the gas tube holes are in proper alignment with each other, insert the 1/16” pin punch into the holes to confirm that you have obtained proper alignment so the roll pin can be installed.
6. To install the roll pin, add some gun oil to the roll pin hole. Brace the front sight base or gas block onto the Armorer Bench Block. Then using the 3/32” roll pin punch, carefully and gently tap the roll pin into the assembly until the roll pin is at the desired depth you want.