I have a copy of a book published some years back by Brownell's, entilted "Encyclopedia of Modern Firearms, Vol I". I do not know if still available or if they ever published Vol II. Included witnin its pages are all those manuals on the US guns mentioned by Lagopus, as well as service manuals for many commercial US guns. I got mine in loose leaf format & put it in a "large" three ring binder.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra