So, another guy in my gaming group and I got into discussing shield abilities and he pointed one out and mentioned that he'd used it in a previous game. In said previous game he was using a Longbow and I immediately wanted to know how he was using a two handed weapon and gaining a shield bonus. The buckler specifically says this isn't possible (at least without feats) but the Heavy Shield, which the Ring of Force Shield imitates has no such wording since you can't use the hand for anything. If anyone knows of any official clarification on this item please post, I couldn't find anything but a lot of speculation and 'well here's how I do it'.