Sorry to drag out an old thread, but I just went through this ordering a scope base for a .22/20ga youth-sized combo.
Ordered through MidwayUSA and used their search to find the item #. The listing that came up did
NOT mention that the Weaver base only fit the barrel for the .22/410 combo. I saw this on the package after I received my order.
Sure enough, the base does not fit the radius of the breech.
Has anyone ordered and installed the Rossi base linked in the previous post? Does it fit the large diameter .22 barrel of the .22/20ga combo? The Rossi site just says it "fits Rossi long gun barrels."
I'm a Rossi newb and wasn't aware that there was more than one breech diameter. Being youth-sized it's a little short as-is, but I wanted something really compact and a good recoil pad will extent the butt a little.
