Here's an extensive collection of
Downloadable Gun Manuals.
I did some perusing, and most of them are the standard owner's manuals (still nice to have if you don't have one for your gun, or just want a digital copy), however I did see that they have the Glock Armorers' Manual, so you might get lucky and get some better documentation that the usual.
To give credit where it's due, I found this posted over at
Harry Flashman's blog.