I picked up a painted wing master for $175 at a gun store. I have fixed it up and looks real nice, especially the walnut. I see it will not accept the 3 inch shells. Only the smaller 2 inch. Does the barrell or chamber dictate what size shell it will shoot? I wanted to add a sling. I installed the front support in the front cap with no problem. I really hate to mess up the walnut stock adding the back support. Has anyone tried the adapter that fits between the stock and the chamber? They seem to be pricey at $30. Thanks Wanna kill these ads? We can help!