Thread: Getting Ar15 adjustable gas block from US

Not into the tube itself (the tube is a consumable remember) into the area before the tube to limit the gas entering the tube.
Some aftermarket barrels have smaller gas holes than others so effectively all ready do this-I have a true flight barrel that has a tiny hole so doesn't really need an adjustable block. The cheeper the gun the more likely it is to have a large hole to make it more reliable-these old guns that no one ever thought were going to get suppressed are why everyone now thinks they need an adjustable block if they are fitting a can.