Keith Anderson,renown for his quality suppressor books has completely revised this manual. It features a more efficient suppressor design than the previous edition and takes you step by step from raw material to a finished military grade suppressor. This suppressor works for AR-15s, .50 BMGs and all models in between. The book covers construction tools, materials and techniques. It even tutors you in the art of welding. It is a must have for serious silencer enthusiasts and if you purchased the previous edition you will certainly want this one. 5.5" X 8.5"