The most common gun you will see at SB silhouette matches are T/C contenders. T/C now makes a G2 contender, and there are plenty of used original contender frames on the used market. Get a 10" .22lr barrel and you ready to go. Other common SB silhouette guns are the Browning Buckmark and Ruger Mark I/II. If you plan to shoot freestyle, get as long as barrel as you can(8-10"). A shorter barrel will work fine for standing. If you already have a .22 with adjustable sights bring that to your first match and you will be able to get a feel for the sport. More than likely someone will offer you a chance to try out some other guns before you buy one.