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The Challenger 2 is equipped with a 120-millimetre (4.7 in) 55-calibre long L30A1 tank gun, the successor to the L11 gun used on the Chieftain and Challenger 1. Unique among NATO main battle tank armament, the L30A1 is rifled, because the British Army continues to place a premium on the use of High Explosive Squash Head (HESH) rounds in addition to armour piercing fin stabilised discarding sabot rounds. The Challenger 2 is also armed with a L94A1 EX-34 7.62 mm CHAIN GUN and a 7.62 mm L37A2 (GPMG) machine gun. Fifty main armament rounds and 4,200 rounds of 7.62 mm ammunition are carried.