 Heavy anti @-@ aircraft ( AA ) fire was provided by a dozen 56 @-@ caliber 100 mm B @-@ 34 dual @-@ purpose guns in six twin MZ @-@ 14 turrets with 400 rounds per gun . The ships began construction with only four turrets , but two additional turrets were restored to the quarterdeck in January 1941 . They could elevate to a maximum of 85 ° and depress to − 8 ° . They could traverse at a rate of 12 ° per second and elevate at 10 ° per second . They fired 15 @.@ 6 @-@ kilogram ( 34 lb ) high explosive shells at a muzzle velocity of 895 m / s ( 2 @,@ 940 ft / s ) ; this provided a maximum range of 22 @,@ 241 meters ( 24 @,@ 323 yd ) against surface targets , but their maximum range against aerial targets was 9 @,@ 895 meters ( 32 @,@ 464 ft ) , the limit of their time fuse . 
