Really they are to heavy, even the sporter configurations? I would be interested in the 270 barrel, is the lug for the bayonet or something else? I would probably purchase or have you install the front sight and if the bayonet lug there probably is a slot in the barrel so would want that as well.
So, are there any commercial barrel blanks that in your experience would work? I'm guessing from my original Johnson barrel you are looking at 2 1/2 pounds or so.
Charlie Foster