It is probably really hard to interest a Publisher in starting such a line from scratch. Then there is the issue of holding the writer's interest to the project. What we see is individual books on specific guns written by different authors from various publishers.
For the second half of the 20th century to the present for US military weapons there exist Field Manuals (FMs) and Technical Manuals (TMs). The FMs are intended for users, while the TMs are intended for repairmen (i.e., ordnance techs in this instance). Many of the FMs and TMs are available either as used books, or PDF downloads.
There are also firearms that have ignited enough collector interest so that individual authors have written multiple tomes about them. Lugers and Colt Single Action Army revolvers or the Thompson SMG are a great example of that. Collectors of such arcane things love to get the books and then argue about whether or not this or that author made an error on page 115 or was the other author correct. Some even forget about the gun but instead write new books (or lengthy blogs) about which author should be ignored.
Other guns with smaller audiences get only one or two books about them. The .35 Remington or the pocket Colts or the Ingram 10 comes to mind.
Regarding the general thrust of your question, a series of books, all by the same author, the gunsmithing series by Kuhnhausen is the only one that I can offhand think of. I am sure there are other comparative works, but I have missed seeing them. If you own one of the guns Kuhnhausen has written about, by all means get that book (or two if one of the guns he has two books about).
Some guns get 20 or more books but only one or two are must reads. Clawson and Goddard and Kuhnhausen, when dealing with the 1911 come to mind as must haves in my opinion.
When reading about guns there are some must reads. Which one is appropriate is partially determined by where your interest lies. I put Hatcher's Notebook in my must reads list, So too is Smith's Small Arms of the World. Note, you are going to have to hunt on Amazon for some of the out of print books, but it is worth your time.
Last edited by superc; 09-17-2011 at 06:24 PM.
Reason: fixed a spelling error, moved a phrase