>>63807550
a shit ton of open bolt SMGs and shotguns, and maybe some single shot rifles, it could all mostly be done with drills, dremels, and some welding and i personally know how to rifle barrels using equipment i can put together from scrap parts.
the middle east is a prime example of why simple SMGs are so easy to make, where they make tons of "carlo" guns.
bolt actions are difficult to make in comparison, and autoloading rifles require locking systems that need to be carefully machined
wouldn't bother with trying to make traditional pistols.