Post-apocalyptic TL 5/8

[adm]

A major problem with black powder to keep in mind, is fouling building up in the barrel. A significant number of automatic actions will not allow for this, and may have a variety of amusing, annoying to downright dangerous malfunctions. On the other hand AK-47s and STEN guns will likely work just fine with black powder, and the first Maxim guns were designed for it, if you can make enough ammunition for them.

Don't forget other ways to make fixed fortification weapons, such as steam.