https://www.usconcealedcarry.com/blog/what-are-the-types-of-guns/
This is a really high level on the different types of firearms out there and is a great article for those who are new to firearms.
Tactical firearms
Military Surplus(M1 Garand, Mosin Nagant)
Replica/Reproduction firearms(Uberti 1894 rifle)
There are only two.
The ones that work and the ones that dont.
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I can only think of three:
- Band (Spearguns are my favorite)
- Pneumatic
- Flammable Powder
(edit) Just remembered Chum Guns
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How could I forget Stun Guns! So my list is up to Four Types of Guns:
- Band (Spearguns are my favorite)
- Pneumatic
- Flammable Powder
- Stun Gun
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And we cannot ignore the ever entertaining Potato Cannon!
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Could be. All it takes is some PVC, hairspray and a gas grill igniter and, of course, a potato!
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@MikeBKY is that the spud gun? Or a potato launcher? If we’re talking launchers, then we need to include the Punkin Chunkin guns… which come in several versions, including rubberband-type power and air cannon, in sizes up to flatbed-mounted artillery. 
I think maybe gatling guns are their own class, as it’s the barrels that go round not the chamber. Not sure how many civilian-legal versions there are, but some people’s husbands have been known to make them in their high school metal shop class. Not mentioning anyone I’m married to or anything. 
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@Zee Here is one to add to that stable of yours. It uses Glock magazines. 
https://tippmannarmory.com/gatling-gun/
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If you’re talking calibers, they range from BB guns to the Schwerer Gustav (English: Heavy Gustaf ) which was a German 80-centimetre (31.5 in) railway gun. So literally hundred.
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