Algodoo

This is the first SMG I've ever made! I'm not very good at making magazines and auto-fire mechanisms. So it jams pretty much.

Easy to handle. Pull back the bolt with the handle and put in a magazine. Then, either pull the trigger or push return. Then pull out the magazine and return to step 1.
When it jams, either go back or try to fix it by dragging the gun or opening it or something.

It's bullpup design and I think it works with phun.