M249 with upgraded quick change gearbox high torque motor,angel custom non ported cylinder has a 120 spring Lonex mushroom piston head, lonex cylinder head Light weight piston brand new trigger switch sks high torque gears,matrix nozzle with a 590mm angel custom 6.01 barrel and epes cnc machined hop up External rep acog sight and a&k full size stock Have 2k rounds through gun since gearbox rebuild Can send video of shooting and of crono if requested Shipping in not refundable