I don't know how feasible some of these are, but I figured I'd give my two cent in as to what I would like to see added. I've also included parody names (in parentheses) little descriptions that could be included, if you would like to use those.

2mm Kolibri* (Pea Shooter)

A weapon that is more of a choking hazard than a threat. 2MM rounds provide a mere 4.0 joules (3 ft-lbs). For perspective, the average person can punch at 10-15 joules. The weapon is so small it couldn't be rifled with 1910 technology, which hurt accuracy. Despite all this, it was produced until 1938.
*You could also make this one a charm)


PPSH-41 (Papasha)
Papasha (Russian for "daddy") was built by panicked Russian in World War 2, it became synonymous with angry drunk Russians screaming about the Motherland. Has an optional 35 round box magazine as an alternative.

M2 Flamethrowerr (F2 Portable Flamethrower)
There are many terrible, terrible ways to die. Death by napalm is among the top contenders. But then again, you're not on the receiving end, so does it matter? The main drawbacks to this weapon is that it chews through ammunition, is very heavy, and does not come with any marshmallows.

H&K G11 (WG-2100)
Equipped with a low-powered scope and a free-floating barrel, unique mechanisms inside the gun, combined with unique "telescoped" ammunition, allows for provides extreme accuracy, a high rate of fire, and a decent reloading time. If you can't handle the 3-round burst, you can go fully automatic, but you'll lose a LOT of rounds per minute by doing so.
*Note: 3-round burst provides 2100 rounds per minute; full auto provides 480 rounds per minute. "WG" stand for "West German(y)", which is where this gun originates.

China-Lake Grenade Launcher (V50 Grenade Launcher)
A pump-action grenade launcher (later known as the "V50") was an attempt to make an easy-to-reload grenade launcher for combat. It was light (8 lbs unloaded/10 lbs loaded), easy to work with, and could dish out up to 15 rounds per minute, as the pump-action allowed multiple grenades to be fired in-between reloads. Despite complimenting inventory the US Navy and Marines had access to, it was never adopted, and was eventually replaced by the M203 underbarrel launcher.
*Note: "V" stands for 'Vietnam', which was when the weapon was introduced. '50' indicates the number believed to have been made.

FP-45 "Liberator" (Rebel-45)
The most basic gun you can find (it only has 23 parts!), it was crude, and not designed to be used outside of pointblank range. Despite over a million being made, less than a quarter actually made it to Nazi-held territory. It was intended to be used as an assassin's weapon; the user could then dispose of it and take the far better weapon that the victim had on them. It came in a cardboard box with 10 rounds of .45 ammunition, a wooden dowel (to remove spent rounds), and a comic strip showing how to use the gun. Good luck actually making use of it.

I might update this at a later date. (Probably not.)