This article is about the history of the 2 cm guns using the 20×138mmB Rheinmetall ammunition, primarily the 2 cm KwK/Flak 30/38 L/50/65. It also covers usage by other nations represented in-game, such as Italy with Breda and Scotti guns, and includes a minor guide. The ammo and guns were the smallest mainstay unit of dual-purpose AA/AT guns, starting in the late 1920s and actively used and improved until 1945. These guns were used as infantry super heavy machine guns (Überschwere MGs), tank armaments (KwK), as well as infantry and vehicle AA guns (Flak).
This guide is about the history to the 10,5 cm StuH 42 L/28. These guns were the mainstay of the German Army, from prewar till the very end. With performance upgrades along its life, it was effectively used in a multitude of roles such as direct support/assault artillery fire and counter artillery. The close up field support was effective against structures, infantry and tanks using a wide array of ammo types. It was only late in the war to be replaced by longer barreled variants such as L/30 and L/35. Being a formidable gun both in-game as well as IRL. It was used on all fronts, upgraded over time and used by multiple nations.
In this guide is about the 7,5 cm KwK and StuK 37 L/24 (as well as modernized K.51). The gun was a prewar development of a compremise of firepower to size. Duo to its size and weight, as well as ammo development put it in a role of multipurpose on a great amount of different vehicles, used prewar till the very end.