Zev posted in the PF oz9 thread. There were some interesting bits of info (sheered lugs, 920 comparison, stacking tolerances) so cross posting for folks subscribed here.
OP: https://pistol-forum.com/showthread.php?42048-The-Current-State-of-the-ZEV-OZ9&p=1464005&viewfull=1#post1464005