For some reason the shotgun won't fire anything and freezes for a split second when you press the space bar. So it won't let me suck up or place items. I tested it in single player and it worked great there. The host however can use the shotgun and works perfectly for them.

The freezing is because you're a client in multiplayer, the gun is a gun so holding spacebar makes you enter "game state", same as if you were shooting at biters, it shows you your true position and whatnot. It's an unfortunate side effect, but it's the only way I could get the mod working.

I just tested multiplayer myself, and everything is working fine for me. Both host and client are able to use the gun normally, so I'm not sure what could be causing your issue. Just so no stone is left unturned, you're sure you have the gun selected, have ammo, and have the items you're trying to shoot out? And you're holding spacebar, not just pressing it?

I'm a dumbass. You're correct I did not have the gun selected. I have hundreds of hours in this game but I play peaceful so I never really have to shoot. Thank you so much!

Lol, happens to the best of us. I'm just glad I don't have to fix some weird mod compatibility issue!