Tokyo Marui G17 4rd Gen GBB Pistol Gas Blow Back Pistol with Semi-Automatic Shooting Mode Innovative Hop-Up Thumb Dial located inside the gun (can see after dissemble the slide) Extreme well-built gas blow back pistol Come with "GLOW-IN-THE-DARK" Front & Rear Sight Textured grip and authentic engraving on grip & slide Very loud & crispy Blow Back sound with Hi-Kick Recoil Extreme high accuracy among all other competitor Disassemble procedure is as the same as the real steel Ready for Green Gas