The q3a super shotgun model also has a short laser sight. I suspect OA's shotgun modeler just liked that feature and included it in their version.
Now that you mention it, that does seem a bit off. I never noticed it. I think my eye was drawn to the banana clip.

On the roadmap, the shotgun is one of the weapons listed for remodeling. Any ideas for improved version? That revolver of your's was pretty cool.