How to make a marksman revolver from ultrakill

So, I wanted to create a marksman revolver from ultrakill.

The specific part that im in need for is coin thing. I want it to toss a coin (either an entity or something else) which disappears after like 80 ticks when either the gun item is swinged or if player crouches and if you shoot the coin it'll teleport the projectile that hit the coin to the nearest enemy that isn't the player. The coin toss could be just with cooldown but if it's easy to do, then it could be like in ultrakill with maximum of 4 coins that regenerate overtime.