Mach Sakai reviews the newly released Tokyo Marui M4 CQB-R Block 1 Gas Blowback Rifle. This is the second GBB in the Tokyo Marui MWS series, with their first model being the M4A1 MWS GBB-R with the ZET System. Mach Sakai tests this GBB rifle for detail, muzzle velocity, accuracy and range.