The K-73 is a 9mm carbine based off of the Heckler and Koch MP5 with a much longer barrel and extended gas tube; it effectively doubles the weapons effective range. Also it has the ability to fire Russian overpressure rounds giving it the ability to pierce light body armor and Kevlar helmets. The handguard has been modified and extended. Designed for law enforcement agencies. A semi automatic version is availble for civilian shooters it also can only have a fixed stock in Canada.