This book is the Ronseal of Roleplay books, it does exactly what it says on the cover.
With over 300 firearms covered in this book with rules for the D20 modern system what more could you ask for?
well, this book also supplies a few feats to use the firearms in the system far more effectivle, it also adds new ammo types and even has rules for reliability.
This is not all, it also has a list of weapons used by various organisations in the world, such as the SAS and SBS.
The book is pimaraly abouth the firearms, espessially the pistols and sub machine guns, so don't expect this book to keep you occupied for too long.
a valuble buy for any one wanting to run, or play a d20 modern campaign.