Originally the 22 and 17 Hornets used the same magazine. Some of my magazines are marked 17/22 Hornet. Apparently, some people had feeding issues with their 17 Hornets though. So, CZ came out with the newer 17 Hornet magazines. These have slightly longer magazine feed lips to control the round a bit more as it's being fed into the rifle. I'm not sure as to which part number is which but you probably want the newer style magazine.