 Her turrets were modified to use a fixed loading angle of 6 ° and fitted with more powerful elevating motors which increased their rate of fire to two rounds per minute . Their maximum elevation was increased to 40 ° which extended their range to 32 @,@ 320 yards ( 29 @,@ 550 m ) and they were redesignated as MK @-@ 3 @-@ 12 Mod . She landed her old ' Lender ' AA guns and replaced them with six semi @-@ automatic 45 @-@ millimeter ( 1 @.@ 8 in ) 21 @-@ K AA guns , three atop the fore and aft turrets . Three 76 @.@ 2 @-@ millimeter ( 3 @.@ 00 in ) 34 @-@ K each were mounted on platforms on the fore and aft superstructures as well as a total of twelve 12 @.@ 7 @-@ millimeter ( 0 @.@ 50 in ) <unk> machine guns . Her fire @-@ control system was completely revised with a pair of KDP @-@ 6 fire control director , equipped with two 6 @-@ meter ( 20 ft ) Zeiss rangefinders positioned atop both superstructures . Her original Pollen Argo Clock mechanical fire @-@ control computer was replaced with a copy of a Vickers Ltd fire @-@ control computer , designated <unk> by the Soviets , as well as a copy of a Sperry stable vertical gyroscope . She also received the first stabilized anti @-@ aircraft directors in the Soviet fleet , SVP @-@ 1s that were fitted on each side of the forward superstructure . They were manually stabilized and less than satisfactory as the men manning them had difficulties keeping their sights on the horizon while the ship 's motions were violent . 
