13.5inches (343 mm) and the barrels were 45 calibres long i.e. 607.5inches (15.43 m). The guns were greatly superior to the unrelated earlier 13.5-inch
The 5-inch (127 mm)/54-caliber (Mk 45) lightweight gun is a U.S. naval artillery gun mount consisting of a 5 in (127 mm) L54 Mark 19 gun on the Mark 45
The BL 5.5-inchgun was a British artillery gun introduced during the middle of the Second World War to equip medium batteries. In January 1939 a specification