Not exactly the newest gas blowback rifle, the Tokyo Marui MK18 GBB Rifle with the ZET System gets tested by Mach Sakai. The Tokyo Marui MK18 Gas-Blowback Airsoft Gun is a full-metal, realistic replica of the popular MK18 assault rifle. It features a Daniel Defense handguard, metal outer barrel, metal buffer tube, and SureFire type flash hider. It also has an ambidextrous fire selector, flip-up front and rear sights, and Cerakoted upper and lower receivers for scratch resistance and durability. The new ZET bolt lock system is more reliable than standard bolt locks on other gas blow back M4s, and the gun has great gas efficiency.