This book is the most comprehensive collector's guide regarding the splendid and famous luxury Beretta SO family of over-and-under shotguns. It develops the history of conception from 1934 by describing the different models until 1987, such as S1, S2, S3, SO3EELL, SO4, explaining the applied technical and phenotypical changes. The author depicts each single detail, such as the functioning of the marvelous and ingenious Beretta sidelock and its ejector system as well as the applied morphological evolution. The book you have always waiting for.