Make sure that the cylinder you are purchasing has the gas ring in the same location as your current cylinder. I found a cylinder from a M17/18 but the gas ring was wrong. Rather than trying to find a correct cylinder I back doored the project and found a correct yoke thanks to a member here. Now all I do when changing from 22BB, CB, Short, Long, LR to 22 WMR/WRF is unscrew the yoke screw and change the yoke/cylinder assembly.

Class III