collision_line(x1,y1,x2,y2,obj,prec,notme)
For shooting weapons and for many other needed things ...
"Bullet plugin" work incorrect on fast bullet speed.
I agree it would be very useful.
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Try looking into the "Instance hit" option with the bullet behavior. I'm not able to make an example right now, but if you need one I can pull one together later. The wiki-page for the bullet behavior should be able to give you a good idea of how it works, though.