I have Jerry Kuhnhausen's shop manual
http://www.gunbooks.com/us30.html
and do not regret the purchase,
BUT...
The Kuhnhausen books are
shop manuals, loaded with information that presumes a shop and the machines and tools that go with it, going far beyond what most shooters need or want to know.. They are not well indexed and can require much searching to locate answers to this shooter's questions. On the other hand, they make great browsing for an enthusiastic gun owner.