I know Robar does a Glock frame modification; www.robarguns.com
. They did a full contract for the AK State Troopers so you know they make quality products.
A aftermarket firm has alloy Glock frames, see; www.glockstore.com
or maybe www.glockworx.com
. I think CCF is a Glock frame brand too.
Morgan Boatman's www.glockbooks.com
may aid you.
I'm not a Glocker & do not own any models. I may buy a Glock 19 Gen 04 9x19mm from Lipsey's(FDE limited series). I'm going to wait for the gun craze & hysteria to quiet down.