ar15.com
if you cant find what you need there, just ask. Plenty of forum to browse through, with manuals and info for builders as well. Good resource there as well for the ak platform too. Most folks there are helpfull. Word of caution, the general discussion section is a free for all, and can get a bit out of hand. The hometown section for Wisconsin has a pretty good group of regulars, comparable to here. YMMV