QF 6-pounder Hotchkiss
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![Britain 6-pdr / 8cwt [2.244"/40 (57 mm)] QF Marks I and II - NavWeaps](/imgres?imgurl=http://www.navweaps.com/Weapons/WNBR_6pounder_m1_sketch_pic.jpg&imgrefurl=http://www.navweaps.com/Weapons/WNBR_6pounder_m1.php&h=608&w=960&tbnid=SEbtKGO7obxmaM&q=QF+6-pounder+Hotchkiss&tbnh=94&tbnw=148&usg=AI4_-kRx129xN_iDEQGxZNF37s4JdE20Ig&vet=1&docid=J3aDxVu_RwG5DM&sa=X&ved=2ahUKEwizk7bKnNyFAxXnUEEAHRWeC8oQ9QF6BAgAEAc)
The Ordnance QF Hotchkiss 6 pounder gun Mk I and Mk II or QF 6 pounder 8 cwt were a family of long-lived light 57 mm naval guns introduced in 1885 to defend against new, small and fast vessels such as torpedo boats and later submarines. Wikipedia
Barrel length: 7.4 ft (2.3 m) 40 caliber
Breech: Vertical sliding-block
Calibre: 57-millimetre (2.244 in)
Effective firing range: 4,000 yards (3,700 m)
In service: 1885–1990
Manufacturer: Elswick
Mass: 821–849 lb (372–385 kg) barrel & breech