Selling my A&K m16a4 dmr shoots pretty much 440fps on the dot with .20's gearbox was gutted and upgraded it now has g&g gears, shs steel tooth piston, stainless steel cylinder, lonex piston head, lonex cylinder head, gate paco mosfet, m120 spring, stock hop up (shoots like a absolute dream with it) madbull 6.03 black python barrel gearbox is a quick change gearbox. A&K Titan high torque motor. You pay paypal fees and shipping