12"/50 caliber Mark 8 gun
... that the 12"/50 caliber Mark 8 gun, an American naval gun mounted on the Alaska-class cruisers, "was by far the most powerful weapon of its caliber ever placed in service"?
... that the <b id="mwEYQ"><a class="mw-redirect" href='./12"/50_caliber_Mark_8_gun' id="mwEYU" rel="mw:WikiLink" title='12"/50 caliber Mark 8 gun'>12"/50 caliber Mark 8 gun</a></b>, an American <a class="mw-redirect" href="./Naval_gun" id="mwEYY" rel="mw:WikiLink" title="Naval gun">naval gun</a> mounted on the <a about="#mwt38" data-mw='{"parts":[{"template":{"target":{"wt":"Sclass","href":"./Template:Sclass"},"params":{"1":{"wt":"Alaska"},"2":{"wt":"cruiser"}},"i":0}},"s"]}' href="./Alaska-class_cruiser" id="mwEYc" rel="mw:WikiLink" title="Alaska-class cruiser" typeof="mw:Transclusion"><i>Alaska</i>-class</a><span about="#mwt38"> </span><a about="#mwt38" href="./Cruiser" id="mwEYg" rel="mw:WikiLink" title="Cruiser">cruisers</a>, "was by far the most powerful weapon of its <a href="./Caliber" id="mwEYk" rel="mw:WikiLink" title="Caliber">caliber</a> ever placed in service"?