A new 57 mm self-propelled anti-aircraft gun for Russia is in the works
The Burevestnik Central Scientific Research Institute is working on a new 57mm self-propelled anti-aircraft artillery system for the Russian military.
By Sgt. Ryan Ward, U.S. Marine Corps [Public domain], via Wikimedia Commons
Source: A new 57 mm self-propelled anti-aircraft gun for Russia is in the works