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How to remove the gas tube on a Bushmaster M4.

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Carbon build up can cause the gas tube to be difficult to remove. Turn the barreled upper receiver upside down and lightly clamp the gas tube in a 4" vise with the handguard cap against one side of the vise. Then you can lightly tap on the rear of the receiver with a plastic mallet which will drive the tube out of the sight base.
If anyone has applied Loctite to "seal" the gas system a propane torch should be used to warm that area to soften the Loctite.
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