A compendium is a comprehensive but brief account of a subject. It is a collection of concise but detailed information about a particular subject, especially in a book or other publication. It is also synonymous with a digest, compilation, collection or corpus. This compendium is an in-depth study of several specific variations and accessories of the Thompson submachine gun. This compendium includes: (1) The First Savage Thompson - several chapters on the earliest Savage guns (2) Savage Commercial Thompsons - never seen before information (3) Freedom of Information Act requests specifically for a potential Savage Commercial Thompson (4) The Bridgeport Commercials - eighty 1928ACs are pictured and reviewed (5) The NAC Thompson guns - an in-depth review (6) Potomac Arms - the story and serial number information for over 400 Thompson submachine guns (7) Spare Part Kit update - two new variations and more information on the Herigstad kits (8) A French Colt returns home (9) How to identify Colt wood This is a must book for the Thompson enthusiast's library! Other books by Tom Davis, Jr. - An Amateur's Guide for the Colt's Thompson Submachine Gun & Great Britain - The Tommy Gun Story