Mitch Rapp
Well-Known Member
Bought an AR with a 20 inch barrel from an older gentleman. He built it about 20 years ago, with a Wilson barrel. Apparently they put their barrel markings just forward of the chamber, well this barrel has a free float rail with a large barrel nut. I really don't want to remove the barrel, nut and from what I have read it may not have it may not list the twist rate.
My low tech way of trying to determine twist was to run a rod with an index mark on it, with a tight patch and count the revolutions. 20 inch barrel, chamber of about 2 inches, so if it's 1-9 it should make exactly 2 turns, if it goes past the mark a second time it's a 1-8? Can anyone punch any holes in my logic or tellw me a better way to do it?
My low tech way of trying to determine twist was to run a rod with an index mark on it, with a tight patch and count the revolutions. 20 inch barrel, chamber of about 2 inches, so if it's 1-9 it should make exactly 2 turns, if it goes past the mark a second time it's a 1-8? Can anyone punch any holes in my logic or tellw me a better way to do it?
