LTT PX4 CC red dot question

I started to carry this and love it. Thinking about sending out for direct milling but want to know differences between EPS carry VS EPS MRS full size. Which one fits just right for the slide without overhang?

I started to carry this and love it. Thinking about sending out for direct milling but want to know differences between EPS carry VS EPS MRS full size. Which one fits just right for the slide without overhang?