You might have been looking at a G19C and thought the 'C' stood for compact. It means compensated. Probably not the best thing for a gun that you might use to protect yourself with. Sorry if that's not what you meant.
Besides that, the Glock 19 is built around Glock's "compact" sized frame. There are some differences between the generations, but the ones you are most likely to find on the 'New Guns' shelf are generation 3 and 4.
RTF2 is a generation 3 pistol with a special grip texture. It stands for Rough Texture Frame 2. Gen 4 glocks have a texture that is very similar but a little more subdued.