The most customizable marker ever - made for a thousand different looks. New magnesium receiver is extremely lightweight and durable. New Cyclone EP (Enhanced Performance) system feeds up to 20 BPS. New air-thru stock compatible system eliminates gas line under the marker. New low profile, offset hopper for clear site line. Modular shroud with four rails to add on sights and scopes. AR15 style magazine with built in tool storage. Picatinny top rail to easily add new risers, sights or handles. Upgraded adjustable rear site helps with long range aiming. Push pin design for easy field stripping and accessory add ons. Includes maintenance pack, barrel sleeve, and gun oil. The Response Trigger Kit is patented for rapid air-assisted firing at 15 rounds/second.