This is a mod I won't upload and which would benefit of some improving, but I lost interest in it. Nevertheless it's an interesting work, which might inspire other modders.
It's a real gun (aka "has a real bullet instead of modified long hands") and a trigger to time your shot.
Instructions:
1. Hold all and grab your right hand
2. Point gun at Uke
3. Ungrab your hand. The rotating trigger will shoot the bullet.
Don't move around wildly in round 1; just hold all and grab is a start which make it function as intended.
Have fun ;)