Description This is for a Tippmann X7 Paintball gun with Response Trigger factory installed. The Response Trigger System increases your trigger speed by resetting the trigger and sear with excess gas during firing. This gas is used to operate a cylinder behind the trigger to do the resetting. The pressure of your finger on the trigger pulls it back to fire the next shot. Features The most customizable marker ever made with 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 Full Two Year Warranty From Tippmann.