Reply To: I just spent more time on that screw than this entire gun
As simple as it looks at first glance, this kind of screw is (almost?) impossible to make perfect with Subsurf modeling.
The logical thing to do, is to not use a Subdivision Surface Modifier (make the screw as a separate Object), something simple like this:
This was made from a default Circle (I know, it’s easier to start with a Cylinder…); the number of Vertices influences the width of the slit.
And long live the N-Gons! (I remember the time when N-Gons weren’t yet supported in blender….)