Originally Posted by
The Archangel
I may be mistaken because the gunsmith that cut down the barrel said a lot of things. I was in awe of the whole process as I am more of an end user and an amateur tinkerer of parts than a machinist. I can build a gun from the ground up with parts that are already made. As far as machining parts, that is beyond my mechanical abilities.
I thought he said that it was 1/16th, but it may be bigger than that. All I know is that the gas port is significantly larger after he drilled it over stock.