Artillery in Canada: quadruple 20-mm Polsten anti-aircraft machine gun

20-mm, Polsten Anti-aircraft Machine Gun (Library and Archives Canada Photo, MIKAN No. 3607616) Polsten 20-mm Quadruple Anti-Aircraft Gun Mk. I, mounted on a CMP truck.  The Polsten was a Polish development of the 20-mm Oerlikon gun, designed to be simpler and much cheaper to build than the Oerlikon, without reducing effectiveness. It was used on … Read more