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QF 4 inch Mk XIX naval gun : ウィキペディア英語版 | QF 4 inch Mk XIX naval gun
The QF 4-inch Mk XIX gun〔Mk XIX = Mark 19. Britain used Roman numerals to denote Marks (models) of ordnance until after World War II. This was the nineteenth model of British QF 4-inch gun〕 was a British low-velocity 4-inch 40-calibre naval gun used to arm small warships such as and s and some s in World War II, mainly against submarines.〔DiGiulian〕 ==Description== It succeeded the higher-velocity World War I-era BL 4-inch Mk IX (typically deployed on s in the escort role), increasing the shell weight from to and its high-angle mounting added some anti-aircraft capability and allowed it to fire starshells to illuminate the battle area at night.
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