Guns like this twin 3-inch weapon were fitted to most of Canada's warships built during the Cold War.

This particular version combined two guns on a power-driven mount covered by a housing that helped protect the complex weapons from the elements. The mount, requiring a crew of 12, had a rate of fire of approximately 50 rounds per minute per gun, and could be used against aircraft or surface targets including ships. This gun was installed in the forward gun mount of HMCS Qu'Appelle, a Mackenzie class destroyer launched in 1962.

Naval Gun, Twin 3-Inch/50 Calibre
CWM 20090098-001