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The Sherman Firefly was a World War II British variation of the American Sherman tank, fitted with the powerful British 17 pounder (17-pdr) anti-tank gun as its main weapon. Originally conceived as a stop gap tank until future British tank designs with the 17 Pounder came into service, the Sherman Firefly in fact became the most common British tank fielded during World War II armed with the 17 Pounder as its main armament, with a production run of some 2,100 Fireflies being built or converted.