I have a sling for my doubles that slips over the barrel, too, but I only use it for duck hunting where I have to wade in and carry a deke bag. I can't shoot with it on, though. The loop over the rib drives me nuts when I look down it. Once I get where I'm going I pull it off. I might be able to shoot with one that was open at the top so I could see the rib "between" the sides of it, like yours, Ted. My fingers don't bother me shooting when I wrap them up around the barrels on each side of my little doubles. Not much difference.

Here it is on my big HE Fox:



SRH

May God bless America and those who defend her.