Algodoo

spawning stuff is super easy!
make a gear or square and make it collide with something besides the collision group of the thing you are going to spawn
then make sure the hinge is a motor so the spawner (gear/square) repeatedly hits something
then in the script menu section titled "oncollide" type:

scene.addcircle({ pos := e.pos; radius := *X*; color := [0,0,0,1]})

replace *X* with the desired radius
you can also change the color
make sure you type this in between the origional {} things

ummmmm....
there isnt really a way to spawn a single object with the click of a key that i know of... it would have to be built mechanicly
would you like me to make it work the way you want it to for you?

if so should the gun be lower profile and should the bullets be smaller