Thanks for the info guys.
I did look at Suarez and a couple other slide/upper options. For the price of one of those with internals and iron sights and a barrel, I'd be ahead to just buy a new Glock MOS pistol.
Looks like I could have one of my Gen 2's milled and refinished with cerakote for about $150 by Battlewerx, or a few other places on the 'net.
http://www.battlewerx.com/vortex-venom-cut-for-glock/Thanks for the help, Shane