I'm going to leave it to the professionals to get the job done properly, but I want to make sure everything gets done quickly and efficiently with as little time wasted as possible.
If you either thread the standard 16" barrel, or chop it down to around 11.5" (done in accordance to all applicable laws) do you need to remove the barrel from the upper?
Will I need to get a barrel nut wrench or get one made before I go to this step?
How does one "clamp" the shorter barrels to work the barrel nut?
KBK