I've been using one for several years now on my 1895GS 45-70 except mine does not have the shell holder set up inside the pouch and is OD green..
I have my scope mounted on Warne 2 piece nickel bases with quick detachable Leupold QRW rings when I pop the scope off I remove from the butt stock pouch my low Weaver XS Sights backup ghost ring sight and a small screw driver pop it onto the rear scope base put the screw driver back into the pouch and I am ready to go.
I left my rear sight at home once so I was left with having to go into heavy bush after a grizzly with the scope still mounted.
I will never do that again now that I have this butt stock pouch.
My avatar pic is that grizzly...