This version of the Tippmann A5 has a reactive trigger (RT) installed.  The RT uses gas pressure after each shot to push the trigger forward harder than the shooter pulls the trigger back.  This causes the trigger to rapidly fire, creating short burst of full auto firepower. The Tippmann A5 paintball gun is highest end of Tippmann’s “blow-back” marker guns.  (Blow-back markers use a sear to release a hammer.  The spring loaded hammer then hits the main valve, opening it to allow gas to propel the paintball.)  Other Tippmann paintball guns that are internally similar to the A5 include the Tippmann 98 and US Army paintball guns.  What makes the A5 unique from these other guns is the included Cyclone Feed system and the “MP-5” design look.   The cyclone feed is a hopper system made by Tippmann that uses a gas powered ratchet to load each ball as you shoot.  This ensures a jam free shooting experience.  The A-5 uses push pins to hold the body together.  This makes disassembly for cleaning very fast.  The A5 body is die cast aluminum with a flat black powder coat.  The gun features a front cocking knob that prevents dirt from entering the gun.  The cyclone hopper included will hold 200 paintballs. This is the RT version of the Tippmann A5. There is also one with a mechanical trigger (single shot / semi auto). The A5 accepts many upgrades.  Most common are barrels, stocks, two finger triggers, and offset hoppers.  Check out the A5 Upgrades section for the complete selection. Tippmann Parts Staff Thoughts: The A5 RT is the apex of tippmann mechanical markers that use hoppers. With the RT installed, this is a very fast firing paintball gun.  The construction is rugged, tried and true.   Upgrades to consider: Lot of barrel options for more accuracy.  Flatline barrels and Apex barrels for more range.  TechT and Lapco Cyclone feed upgrades for faster cycling.  Several stocks will also mount to the back of the gun. The A5 includes: A5 Paintball Gun Hopper Repair tools Basic replacement orings and oil sample Safety Barrel Sleeve Instruction Manual 2 Year Warranty