The Italian army had two standard 20 mm anti-aircraft weapons during World War II. One was the Breda and the other was the Cannone-Mitragliera da 20/77 (Scotti) that was first designed in 1932 and produced by the Swiss Oerlikon company that used a 60 round drum that was eventually discarded in favor of 12 round trays for the ammunition. Compared to the Breda, the Scotti was a far simpler weapon. It resembled the Oerlikon in some respects, but used a different mechanism. The Scotti was easier to manufacture than the Breda, but despite using a longer barrel, the Scotti’s overall performance was inferior. The same ammunition type was used, but, based on the lower effective ceiling, with a different propellant charge. To balance this, when used against targets at low altitude, the rate of fire