Brownell's source of exploded diagrams
If you'll go to brownells.com and, on the Home page, scroll down completely to the bottom of the page. There are a bunch of links down there below a wide, brown line. One of them is <Schematics>. Click on it and you are presented with a bunch of Manufacturer's logos. Click the one you want and they will display the schematics that they have for the guns made by that manufacturer. They're PDFs @ $.99 each. I just got six of them, which they deliver via email with a two-day delay. The schematic includes the exploded diagram, parts list with prices, and the accessories that Brownell's carries for the specific firearm. Pretty cool.