I've enlarged the target from the contest to match the gun scale.
It is now fired by pulling back the trigger, and reloaded by dragging bullets into the open chamber when the gun is empty.
push up and down to aim the pistol
the pistol is fairly reliable, if it gets jammed just pull back and down the reload pin, so the gun will be in reload mode and remove whats jamming it, then pull the pin back up to release it. On the rare occasion the hammer might be the jammed part, so you just pull that back instead, or alternatively although rare in my experience it might self destruct
but i havent had that happen for a while, so i'm assuming its safe now
this video from the MKI prototype although the mechanics are not entirely identical, the principles to operate the gun are still the same, including reloading essentially, so hopefully it can help you use it.
I might update the video at some point with one of the MKII in action.
EDIT : if your having trouble with the reload, click the slide and send it to the back - should be a bit easier to see the mechanism your working with then!