The cylinder you show above is a 22 caliber (short,long,long rifle) as it has the firing pin groove going around the "back" (chamber to chamber) the 'Magnum' cylinders do NOT have this groove, yes, they LOOK the same from the side, flutes and all,BUT not in the rear, chamber area, as well as the chambering itself ,to the larger, longer , magnum...........what is the overall length you are looking for?? this helps us to find the 'right" ( or at least close enough to make it work), so you do NOT buy a 'pig in a poke....'