ACF is not compatible with SIG MCX.
ACF-Randy is blemished, the bottom of the ACF is machined a bit unevenly. The blemish has zero bearing on functionality and is invisible once installed. We don't care about such minor cosmetic imperfections, but it's not 100% to our liking, so ACF-Randy is marked down. Discounts will not apply to ACF-Randy. ACF-Randy has a letter R marked on the tip of of the ACF body, invisible once installed.