Mach Sakai reviews the King Arms M79 grenade launcher, a gas gun that uses 40mm Moscart cartridges. He goes over the M79's features, including its adjustable sights, a handguard, and a trigger mechanism. The reviewer tests the M79's accuracy and power with 8mm BBs, a 24-round Moscart cartridge, and a 165-round Moscart cartridge, firing at targets placed at 5m, 9m, and 10m. Overall, he finds this M79 grenade launcher for airsoft use to be fun and powerful.