There is are a lot of model's out there, early flat back, pre accutrigger, m 10, 110 had wood stocks, the m11, 111 series were synthetic. The difference between the m 11, 111 is that the 2 digit code is for short action length, 3 digit code is long action designation. With the improvement of the accutrigger came the end of the flat back reciever in favor of the round recievers in manufacture today. They also a few years back changed the 10, 110 to indicate tactical models, and the 11, 111 are sporting, varmint, target rifles. Though 11's are a short action, the action length is only about a half inch shorter, easier to mount optics on, perhaps a little bit stiffer due to a shorter length. The 12 is usually a heavy, barrel target or varmint rifle, cabellas, bass pro m12 fv, is a cabellas spec that savage built for their store chain, like the field and stream, Dick's model 11vt. There are other 12's like the m 12 bvss, much higher-end in the savage line, is a laminated stock, stainless, short action. Hope this helps.