I have a question to throw out today. Did Colt or should I say the company or companies that made the Colt scope ever make a 4x21? The reason I ask is I was looking on Gun Broker and came across an SP1 topped with a scope as described. I have a 4x20 on my SP1 and nothing looks right on the one for sale. The windage adjustment knob is way to large, the Colt logo is to the rear of the scope and to the side too. I I thought I knew my colt scopes since I have owned a few over the years, but maybe I missed something. Any thoughts on this?