"American Gun" by Chris Kyle, he is the US Navy SEAL killed recently by a fellow war vet he was trying to help.
The book was written by him but published after his death. In it he picks 10 of the most important firearms (in his opinion) in our history and how they shaped our country. He gives stories of each weapon and how it was developed and used which makes it interesting and easy to read and because it covers 10 different weapons it can be enjoyed in short segments without loosing a story line which should appeal to those who don't normally like to read a lot.
If you enjoy shooting you will enjoy this book.