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The Mk V was a MK I/II airframe with longerons strengthened to take a Merlin 45 powerplant combat-rated at 1470hp. By June 1941, production of the Mk Va with machine gun armament was terminated in favour of the Vb, which had a mixed armament of 20mm cannon and 0.303in. MGs. As the most numerous of all Spitfire variants, the Mk V was eventual to equip more than 100 RAF squadrons.