Pappy,
I hear you, I've put a red dot reflex on the .410. My 8 year old grandsons shoot it like they're playing a video game. The 20ga. is going to be double duty, turkey/deer slug gun with the added benefit that pulling the scope off returns it to general shotgun duty.
With a 1 piece Weaver base drilled and tapped and old fashion Weaver lows this thing is mounted like a rifle. It's mounted so low I don't loose the ability for a good cheek weld. And being the old fart I am, a scope is more natural to me than a dot.
