Algodoo

Load magazine, cycle bolt, fire with trigger.
Don't grab anything that isn't bright red, whole scene is drag-tool operated. No buttons
Getting the magazine in is hard and clumsy, but it was made to be put in back first, then pushed straight in.

Red objects include mag release, slide, trigger, and magazine(grab from the circle, it's easier)

I loosely attached it to the background with a inge to make it easier to handle.

Mostly inspired by NoTarget, but it's just something I came up with instead of a recreation of a real gun.