About to finally order my 2.0 and thought I'd check back on this. Since S&W is stating that the strengthening of the 2.0 frame results in reduction of felt recoil, and the fact that they haven't produced a long slide CORE version yet is why I'm interested in being able to transfer my comp'd slide with optic to the new frame. If I have to cut a higher notch at the rear of the recess in the CORE slide to accommodate the new stop design, and not compromise anything, then I'm willing to do that. Even if I can't go back on the original frame with it and have to save that for parts. As soon as I figure out if this is possible, I'll do my best to report back.