M53 Semi-Auto 8mm 21 Inch Barrel With 1:9.5 Inch Twist Bipod Includes 100 Round Belt and Can M53 Belt Fed Semi-Auto Rifle. Semi-auto copy of the German MG42 infamous for its use by the Germans in WWII. Four groove barrel has a 1 in 9.5 inch twist. Includes bipod. Comes with 100 round belt and can. Barrel is twenty-one inches. Overall length is 48 inches. Weight is 25.5 pounds.