This compact STR-9 model has a portion of the slide machined and ready for the pistol optics of your choice. It comes with four mounting plates able to accept various sight systems. This allows fast target acquisition, and is ideal for those who have difficulty seeing standard open sights. Each STR-9 comes outfitted with a three-dot sight system featuring snag-resistant edges to ensure smooth draws and holstering. Three interchangeable backstraps (small, medium, and large) offer a custom fit to get you on target quickly.