Some of these sites have previously been listed by others, but after I looked at one a little earlier I decided it wouldn't hurt to list all such sites I know of. There'll be some duplication from others posts, but can't hurt
Steve's pages: owner's manuals, Army field manuals, parts lists, LOTS of stuff
The Lee-Enfield Rifle
Speaking of which, how to wrap a pull-throughAlso, the Lee-Enfield Training Rifles
Nicolaus Assoc. 'free stuff' page; information on the Garand, M14/M1A, and other rifles
Unblinking Eye gun pages: information pages on lots of domestic & foreign-made handguns
Captech International, obsolete and hard-to-find cartridge cases
Russian Mosin Nagant, including some information on foreign variants
Olive-Drab, lots on US weapons and equipment
Dragunov.net, the Dragunov sniper and some variants
Sniper Country; what do you think it's about?j
7.62x54r.net, just about everything on the Mosin
Fr. Frog's Pad; firearm & firearm related stuff, including a page on homemade cleaners & lubes
Varmint Al; a whole bunch of stuff, including making tri/bipods, tuning, and a nice mini-lathe page
The Home Gunsmith. The gentleman died earlier this year, but the page is still up. Just knowing that viewing the site probably pisses the Brit government off is enough to make it worth looking at.
M1 Garand serial # and stock cartouche list
The CMP Home Page. Sales of firearms, parts, accessories, ammo. Also tech information, how-to, and if you go to 'rifle sales' and click on the M1 Carbine tab, several articles on ammunition, shooting tips and such.
Swiss Rifles.Com; just about everything you want or need to know about them
Jews for the Preservation of Firearms Ownership
Marstar Canada: assembly/disassembly for a bunch of pistols
That's it for now, as I've got some stuff to take care of and my eyes are crossing. If you know of a good site, let me know and I'll add it.