My buddy has a Remington 870 NWTF version he got a couple of years ago. It came with an Extended Super Full Straight Rifled Tube. Has anyone compared the Extended Straight Rifled SF to the Regular Extended SF chokes from Remington. No longer made, wonder how it was, I know where I can find one if it has good reputation. I wish I could borrow his tube, but that is not an option, very guarding of his toys!