Hello folks. My uncle asked me to look over his old Winchester Model 12 shotgun. From what I gather the serial number number makes it from 1954. The barrel fits very loose to the action. I checked the barrel adjusting sleeve and it has already been adjusted as tight as it can be. So it appears I need the next size sleeve up. I believe the sleeve in the gun might be proof marked with a 1 but it is hard to say for certain. Does anyone know where I can get a barrel adjusting sleeve? Possibly a #2? Does anyone stock these in Canada? Thanks