Here are my proposed small-arms designs:
1. Assault rifle: Sturmgewehr 45: Since infantry combat is usually at close range, at a few hundred meters or so at most, a full-power rifle cartridge would be overkill and relatively hard to control due to recoil, as well as underutilized by most soldiers. This weapon, an assault rifle, combines the controlled firepower and rate of fire of an SMG and the accuracy and stability of a bolt-action rifle. It uses a shorter version (7.92 x 33 mm Kurz) of the cartridge used by the omnipresent Karabiner 98k, and has a detachable box magazine of 30 rounds. It has three firing modes: semi-auto, 3-round burst and full auto. It is also designed to be easy to produce and handle, like the historical StG 45(M), as well as highly reliable and rugged, so that it will not fail its user. It uses a bullpup configuration, that is, it has the action located behind the trigger. This way, it could have a barrel length of 500 cm while being lighter and more compact than with the conventional configuration. Lastly, it can be equipped with a scope and either an underslung knife bayonet or grenade launcher, and has a rate of fire of at least 600 rounds per minute.
2. Light machine gun: Maschinengewehr 45: This is a light machine gun, a weapon that can be easily handled by one soldier, yet can still shower an area in bullets like its heavier relatives. Based on the StG 45, it has a heavier barrel that is more resistant to overheating, a more robust mechanism that is suited to sustained automatic fire, and a bipod for firing from a prone position. It uses the same cartridge as the assault rifle, and can be fed either through a 75-round double-drum magazine or through an ammo belt. It can also use a tripod like its heavier relatives.
3. Sniper rifle: Karabiner 99: This is a semi-automatic version of the Karabiner 98k, with a 10-round detachable box magazine and a scope. This allows a quicker rate of fire for the snipers and the designated marksmen.
