These are BRAND NEW and JUST BUILT! This is a fully internally upgraded Matrix Calico Jack. It is an 11-tooth 18:1 SSG. It has a fully programmable optical mosfet which allowed for safe, semi, binary, burst, and auto. Before you get the gun, I will program to your liking. I will also include the programming manual, so you can make any adjustments if you so choose. You are not buying a used gun here; each one is bought, upgraded, tested, then shipped out. For the price, you cannot find a more reliable and upgraded gun. Parts List: ➪ SHS 18:1 Gearset (short-stroked to 11 teeth) ➪ SHS Double O-Ring Nozzle ➪ SHS Double O-Ring Cylinder Head ➪ SHS Steel Cylinder ➪ SHS Metal Rack Piston ➪ SHS Polymer Ported Piston Head ➪ Double Eagle Optical Mosfet ➪ 28 TPA Super High Torque Motor ➪ Steel Ball Bearing QC Spring Guide ➪ Steel 8mm Bushings ➪ Shimmed to perfection, AOE corrected, & Wired to deans. Other things to mention: ~ The FPS of the gun is determined by the buyer. You tell me the FPS range you want, and I get it to that (within reason, of course). ~ It’s recommended to use a beefy battery with this gun, so a battery pouch may be required. ~ The barrel set-up is stock. It’s a plastic rotary and a brass barrel. That can easily be upgraded at the buyers request. ❗️NO TRADES❗️