The Kel-Tec SUB-2000 is a folding semi-auto carbine chambered in common handgun calibers. It's designed to use pistol magazines, which is why you're seeing "G17/22" in the model description. Folding design (folds in half for storage) Lightweight (~4 lbs) Uses handgun mags (big selling point) This is magazine compatibility + caliber variant: G17 version 9mm, uses Glock 17 mags G22 version .40 S&W, uses Glock 22 mags They are NOT interchangeable-you must match the caliber: 9mm model = Glock 17 mags .40 model = Glock 22 mags Just the color option (tan/brown finish) Same gun mechanically as black version (1)16 Rnd Mag (1) Red Dot Angled Grip Laser