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.
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I agree it would be very useful.
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.