Hey guys, i have been looking for a pistol in 22lr for a month now, and really want to get something for plinking, hunting and steel shooting. I really wanted something that was semi auto, but not really like the buckmark/ruger mark pistols. There good pistols, just wanted something different. Anyways, i came accross the sig website and seen that they offer 22lr pistols in the 220, 226, and the 229.(classic) The thing that really got my attention was that you can buy a slide kit to change your sig 22 to a 9mm or 40 sw. very intreging to me. my questions are, what are the differances between the 220, 226, and the 229? And, in there respected classes, can you buy any slide that matches the lower, or only the classic(x-change kit) ? Make sense? Thanks guys, let me know if this isnt very clear.