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A new type of 4.5 inch gun with a longer 55-calibre barrel, it was designed in the 1960s for the Royal Navy's new classes of frigates and destroyers.The weapon, built by Vickers Ltd Armament Division, was developed by the Royal Armament Research and Development Establishment using the Ordnance, QF 105 mm L13 of the Abbot self-propelled gun as a starting point (it used electrical primers).
From the BL Mark I gun of 1916 the 4.7-inch (120 mm) calibre was the mid-calibre weapon of the Royal Navy, used particularly on destroyers.Apart from some ships armed with QF 4-inch Mk V guns due to shortages, it remained the standard weapon for destroyers up to the W-class destroyers of 1943.
Crew of a dual 4-inch at action stations aboard HMS Berwick while in screening the Atlantic Convoys in May 1943. The Mk XVI superseded the earlier QF 4 inch Mk V naval gun on many Royal Navy ships during the late 1930s and early 1940s. The ammunition fired by the Mk V gun and the Mk XVI guns were different.
The QF 4 inch Mk V gun [note 1] was a Royal Navy gun of World War I which was adapted on HA (i.e. high-angle) mountings to the heavy anti-aircraft role both at sea and on land, and was also used as a coast defence gun.
The term loudspeaker may refer to individual transducers (also known as drivers) or to complete speaker systems consisting of an enclosure and one or more drivers.. To adequately and accurately reproduce a wide range of frequencies with even coverage, most loudspeaker systems employ more than one driver, particularly for higher sound pressure level (SPL) or maximum accuracy.
Marine Corps Systems Command announced February 17, 2005, that it was going to purchase 150 Springfield Armory Professional Model pistols for use as MEU(SOC) pistols. [14] This is the same pistol used by the Federal Bureau of Investigation SWAT and Hostage Rescue Teams; however, it had previously been rejected for adoption as the ICQB.
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