Mad bull Daniel defense lower, krytac mk1 upper w/ mad bull mk18 rail (yes the upper and lower fit together). 2 krytac gearboxes one with gears, mosfet, spring guide, and springs. 1 echo1 gearbox with a cracked shell, shs 16tpa motor, maxx nozzle and spring guide, bore up kit, and 2 m110 springs. Extra springs and small bits to assemble the lower.