I have a 917V. The V stands for Varmint which comes with a heavier barrel. S is for Stainless. CF is for the Carbon Fiber finish on the stock. I would get one of the Varmint models which do not come with sights if you are planning on using a scope. Any gun with 917V in the model number will not have open sights. If you get one with open sights the gun will be slightly lighter but the scope will be mounted high to get over the open sights.