 As a heavy frigate , Sevastopol was intended to be armed with 54 of the most powerful guns available to the Russians , the 7 @.@ 72 @-@ inch ( 196 mm ) 60 @-@ pounder smoothbore gun , and four long 36 @-@ pounder smoothbores . Her armament was revised when she was converted to an ironclad and she was completed with an armament of thirty @-@ two 60 @-@ pounder guns , four on the upper deck as chase guns and 28 on the lower deck . In 1868 , one chase gun and two guns on the lower deck were replaced by 8 @-@ inch ( 203 mm ) rifled guns and 11 more of the 60 @-@ pounders were replaced by seven 8 @-@ inch guns two years later . In 1877 , her armament was changed again to 14 eight @-@ inch guns on the lower deck and two more on the upper deck . Also mounted on the upper deck were one 6 @-@ inch ( 152 mm ) and ten 3 @.@ 4 @-@ inch ( 86 mm ) rifled guns . 
