As I love the game i decided to make one of it's guns
Here i present, the Flak cannon phun version, fully functional, 5 shells magazine + 2 inside the gun (not like your normal everyday pistol that holds only one

)
It is not failsafe, but sometimes just firing again and go through the reloading sequence is enough to un-jam it.
Controls:
Up/Down arrow: aim the cannon (i placed on that base so you could move it, and not have problems with glued to background.
Enter to fire, wait a little before firing again, until the guns stops moving don't shoot again. (if it loaded properly you will see the orange tracers behind the piston)
Have fun and enjoy it!
PD: set the skin to the bakc to see it work, the skin is grouped.