I'm not savvy on 9mm external balistics... If I'm trying to roughly simulate height over bore of a 5.56 gun, and I'm shooting 9mm at 25y or less (probably 15-20y in the bays), I'm thinking a 50-ish yard zero would make that close enough, no?

Progress so far. It looks absurd with the optic, I know, but remember it's a training gun. Still waiting on the muzzle thread protector. I'll build the mags up in the next couple of days. I'm hoping range day will be next week.