Choose Uncle Mike’s or risk a muzzle in the mud. We construct our swivels to be as strong and reliable as they come. With features the competition has been trying unsuccessfully to top since the days of Truman, when we pioneered the modern swivel. Pardon us for talking dirt about the other guys, but you could do a whole lot worse than Uncle Mike’s. Specifications Full magazine tube diameters 645 – 660 in for Winchester and Marlin centerfire lever actions Fits Winchester/Marlin Lever Action Rifles Fits Magazine Tube Diameter of .645\