This suggestion would require quite a bit of work,  but I think everyone would benefit.

Start with a page the has the basic AR outline.  That outline would trigger links to pictures and details of the various accessories available.  Ie:  Buttstocks, grips, etc.

If this site had the ability to host the data - I'm sure the manufacturers would be interested in seeing their product represented.  That way people who are looking to modify or build have one stop to make to see what is out there.

That would also help with the bandwidth from the forums.  Instead of everyone posting pictures during a discussion - they can post a link to the accessories page.