Awesome dude, I bought a Glock for my first gun! The RTF stands for Rough Texture Frame so it will be similar to a Gen4 in that regard. It is a Gen3, and it has the fish gill cuts on the rear of the slide instead of the vertical ones. It is a Glock, so it will be a great gun. Did you get it used? If so, do a safety and function check to make sure everything works properly.