This site has a s**t ton of gun manuals and handbooks in pdf format. This same guy has a lot of military field manuals in PDF format as well. Scroll to the bottom and he has more PDF format manuals and such.
[EBOOK] Book Guerrilla Gunsmithing. PDF [BOOK]. Guerrilla Gunsmithing click here to access This Book: FREE DOWNLOAD. Gunsmithing.
The most important tool a professional gunsmith or serious hobbyist can SAAMI Specs on Centerfire Handgun Ammo; free PDF download). AR-15 - Detailed Step By Step Assembly / Build Instructions (HD)