![]() Apply Vibra-Tite to the barrel nut, as per Vibra-Tite instructions.Ħ. Insert the alignment pin in the gas tube hole in the adapter and the gas tube hole in the receiver.ĥ. Align the gas tube hole in the upper with the gas tube hole in the adapter.Ĥ. Slide the forend adapter over the barrel. (If the barrel is removed, align the small pin located on the barrel extension with the cutout in the upper receiver threads.)ģ. Check to insure that the weapon is unloaded.Ģ. Load one round into a magazine and fire the round with the empty magazine still inserted, open it one more click and repeat until it locks back on an empty magazine.ġ. Once it is closed, open it to the left 3 clicks. With your hex wrench, close the adjustment screw (#3) all the way until it stops. Once the Adjustable Gas Block is installed on the barrel refer to the picture below. How do I adjust the Adjustable Gas Block? If you still want to dimple the barrel you can. The set screws we use in our gas blocks have a special cup that locks the set screw into the barrel. ![]() All of our barrels come with a gas block. ![]()
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