RA split gearbox, used condition. No alterations have been made to this gearbox. 1 replacement screw, from the mk2 spectre few kit. Has 8mm kytac bushings OR 8mm ceramic bearings. You only get one set unless you wanna pay more. Hop up has everything minus the barrel clip, last one i had broke. Has lonex selector plate. $100 shipped and feed. No trades, trade offers will be ignored.