Welder Guy is making a hitch for Bee Sting as we speak. He's going to round off (or chamfer) that sharp edge. He's going to move the receiver pin hole aft. He is NOT going to make the receiver tube longer yet until we find out that it's really necessary. I'll keep you posted. We did discuss the functionality of that collar at the end of the receiver tube. As far as we can tell it only serves the purpose that if you don't have anything in the receiver, and you take a bump on the tube, it will keep the tube from getting deformed. BLUF: on any future orders, you may opt to leave that collar off.
BTW, that sharp corner is because that's the way the stock comes. I was right, it's just cut from lintle (the metal brace that goes over doors & windows in brick homes).