Thanks again. Talked to Colonial. Apparently my tubes were "old design" before Co. changed hands. Can get new tubes fitted, but have to send barrel in. $20-25 for tapping and threading (reasonable), then $26 for each tube, plus shipping. So, looking at abot $120-140 for package. New barrel is about $195, may be better choice.
BTW, "new" shotgun idea was Benelli Nova - comments?
NYH, always have had soft spot for you upstate guys - my wife is from the Hudson Valley (I was from dark side, in NYC). C130, does that refer to the aircraft? Am former Navy flyer, back from days when Spooky was a C-47.