The WE MEU is that the best looking full metal 1911 WE has ever produced. The blow back action is operated by high gas, like green gas, red gas, or propane. The sights function by lining up the white dot on the front sight between the white dots on all sides of the rear sight. The functional grip safety and ambidextrous thumb safety make its operation safe for all users. Numerous other features include forward cocking serrations, improved trigger, and an attachment point for a retention lanyard. The reinforced metal parts include outer barrel, chamber, recoil spring rod, slide stop, safety, hammer, and trigger. the interior upgrade parts include reinforced recoil spring, hammer spring, striker , and a extreme high flow valve. thanks to its high velocity, it consumes even as much gas as a SUV =) and rapid fire might hinder its optimum performance.