My standard going fishing on a river with lots of bears but I really don't want to shoot one gun is a old[60s]M37 Ithaca deerslayer 12 gage with 20 inch Cly barrel.[I could have made that sentence longer but I ran out of breath].
I am using the original open sights but my 50 year old eyes don't like them.
The top of the receiver is drilled and taped for Weaver mounts.Expected range just off the muzzle to 40yards
A.-install a low or no power scope
B.- install a lighted dot type optical sight [like a aimpoint]
C.- install a receiver mounted peep.
I am pretty confident in my rapid target acquisition with a scope as I have used them exclusively since I was 14, but I hate to mess up the easy carrying of a scopeless receiver.
Possibly a long eye relief scout type scope on the barrel?