Um, Why?
I'd leave it stock. IMHO, when you start putting doodads on a Glock you do away with it's number one salient characteristic--box stock reliability, at a great price.
All of my five Glock's are more accurate than I'll ever be, and I don't care much about looks. The Glock is already ugly. If it's worn, send it back to Glock for refinishing.
Just my opinions, of course :wink: . If you chrome it, post pics!