Here's the finished result -

Thanks for the help, all -

Leupold AR Mod 3-9x 40mm green firedot
1" P.E.P.R. mount
Burris FastFire III Red Dot

Red dot was a sweet Black Friday deal from OpticsPlanet - $195 for sight, picatinny mount and hood (not shown). Total for everything about $700 after P.E.P.R. rebate.

Thanks again!