I don't believe anyone makes a flush fitting magazine or single shot adapter for the 452 in 17HMR/22Mag. It is pretty easy to make a four round magazine that fits and looks like the five round mags on the CZ 455. This four round magazine sits about 5/16th below the trigger gaurd. You use the plastic 10 round magazine that's cut down and epoxy on the base plate. Some filing and light sanding and it should work fine and be mostly out of the way when hand carrying.