Earlier reviewers have commented on the author's grammatical mistakes.
Some have mentioned the lack of information where the AR15/M16 is concerned.
They're right, too.
On the first aspect, the author's a Soldier, not an English teacher. Something happened to his editor and his daughter had to take over the editing. Maybe he can get these grammar issues fixed for the next edition - maybe not. As it is, there is no confusion whatsoever about what Mr. Lamb is saying, so for me, the grammar isn't an issue.
On the second, there are many books out there that cover this weapon's history in detail. Doing so in this book wasn't necessary, and had Mr. Lamb attempted to do so in this book, it would have detracted from his work.
What Mr. Lamb DOES do, is share tips and techniques that he's learned over the years, and he does it well. He leads you through equipment selection, layout, and usage. He covers practically every malfunction that a carbine is likely to suffer, and he shows you simple and fast ways to clear them. He lists drills that you can do to improve your efficiency. One of the best tips he gives is how to do a proper 'press check' in the carbine.
Earlier reviewers have commented that Mr. Lamb does not write with a 'my way or the highway' attitude, and that his book is pure 'meat and potatoes' information. Those guys are 100% spot-on. No fluff, no filler, just what you need.
This isn't exactly an entry-level book. As he mentions up front, he assumes that the reader already is already familiar with the care and feeding of the AR15/M16. However, if you're just getting into the world of the carbine, he does give some good pointers on features and accessories that you may/may not want in your own weapon, so this book is still a good purchase for you.
I've dealt with ARs for over 20 years, taken classes, etc. and I can tell you that this book is one of the most solid purchases that I've made book-wise.
Bottom line: If you want to further your education in combat weaponcraft, buy this book.