If you order the .22 Magnum barrel kit, it includes the longer magazine required along with the wrenches to swap the barrels. The .22 lr comes with a spacer that can be removed to swap the longer magazine into the receiver. I just got my .17HMR barrel kit today so I can switch my .22lr standard CZ 455 into a .17HMR.Question.: Does the CZ 455 in 22lr need ??? to make it shoot a 22mag bbl.
New magazine but how is the longer required bolt throw?