The adjustable rear sight on the Gold Cup was first an Elliason design. Then Champion began to make the rear sight. Now, Kensight has bought out Champion. Kensight calls their adjustable rear sight for the Colt the Elliason Sight. Please tell me if the design of this sight has remained the same as it has moved from one company to another. Do they mount the same way? Are they interchangeable? I want to put a JPoint on my Colt. I am told that the adaptor for the Red Dot optic will work for the Elliason sight only. I'm beginning to think that it will work for all the above.