7-inch/44-caliber gun - Wikipedia

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USA 7/44 (17.8 cm) Mark 1 and 7/45 (17.8 cm) Mark 2 - NavWeaps

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7-inch/44-caliber gun - Wikipedia

Techno Arms MAG-7, Gun Wiki

Magnum Research Desert Eagle, Tremors Wiki

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USA 7/44 (17.8 cm) Mark 1 and 7/45 (17.8 cm) Mark 2 - NavWeaps