The other day I received a .22 cal barrel kit for my Crown, as I wanted to see what the gun would do in .22, compared with how the gun came from the factory, in .25 cal. Unfortunately the kit I received from Airgun Depot was missing the .22 pellet probe, which renders the kit useless. Airgun Depot is trying to locate a probe, which comes with the kit, or have FX ship me one. And just for info, I discovered that the .22 cal barrel is quite a bit shorter than the .25 cal barrel.