I currently use a CCC Shaggy for my Gen4 19, but I really wanted to try something in leather, so I bought an AIWB-CDA from JRC.
I had him duplicate the ride height of the Shaggy, and after some discussion, a chicago screw attachment for the loop. That should allow me to tune the ride height, in case it's not quite right, and use different width loops for belt changes.
I hope to have a review after I put it through some range sessions, and a match or two.