Let us know how it turns out. I'd be interestested to know if it improves the accuracy of the setup. Even if it doesn't improve the accuracy, it sounds that you are like me and just like a tight rig. You are correct in fitting the hinge pin to the hole instead of pounding an oversized one into the hole. I don't remove my barrels very often, since most of my frames are dedicated to one barrel. When i do, i use the factory hinge pin to tap out the oversized pin and reverse the process when putting the barrel back on.