In RL I generally use a low magnification red dot scope on a shotgun when I'm firing
very tight shot patterns or single slugs/sabots. For normal spreads I use the iron sights as they offer me an uninterrupted FOV for quickly acquiring a target.
On a side note, I almost never use buckshot/sabots/slugs for large game hunting since rifles are more effective at range (I hunt in California...range tends to be an issue). On the East Coast, of course, it would make more sense to use a shotgun as it has a shorter range and poses less danger to the comparatively more crowded environment.
To further drag things away it would be awesome if the medic had those steroids from DA1