So update on the OZ9
It's a great shooter. I purchased a Zev threaded barrel, comp and FDE frame to get it up to the configuration I prefer. The Zev trigger mounted in the metal housing takes all the flex out that confounds glock trigger/frames.
Mag weren't so simple. The Pmags work ok , Glock factory mags are no good with the magwell installed. I ended up getting some Amend2 18 round (pinned) mags that because of the slightly longer body work flawlessly once I took a couple 0.001s off the baseplate "wings". 
Overall I am extremely pleased with this pistol.