Makeshift weapons

[BBEG]

I'd support new kinds of zip guns if their ammo was limited to what you built. 

They're supposed to kinda suck though for balancing. 

A shotgun should be like, one shot. 
A machine gun could work if there was a huge drop off in damage at a distance or the barrels could blow out

they way i see balancing zip guns is keep them 2 shot and replace the chance to explode with a chance to misfire and make it only use pistol ammo

shotguns were already discussed above

and machine guns could both have complex recipe at least 8 things to put together and have a chance to jam that you have to take a few seconds to clear