The Breda Ba.64 was an Italian ground attack aircraft first put into service in 1937. By 1939, Regia Aeronautica began replacing them with the Breda Ba.65.
The Scotti Cannone-Mitragliera da 20/77 was first produded in 1932. It was a far simpler weapon than the Breda 20 mm, but the performance was inferior.