The Combat Machine Series from G&G offers the same great quality engineering and craftsmanship you would expect from a high end manufacturer like G&G, but at a budget friendly price. G&G would describe their Combat Machine line of Airsoft rifles their "intermediate" series, with the Top Tech brand being their high-end line. So don't call Combat Machine rifles entry level airsoft guns, because that would be selling the brand short. All Combat Machines feature metal gearboxes, including 8mm oil less bearings, plastic piston heads, plastic cylinder heads, 25, 000 rpm motor and Nylon Fiber receivers instead of inferior ABS used by other brands. For an extra value check out the Combo kits that feature 9.6v 1400 nunchuck style batteries and G&G's quality smart chargers.