This compact model with ambidextrous manual safety, chambered in .45 Auto, is 7.25" long and 4.65" high with a 3.75" barrel and weighs in at 29 ounces with an empty magazine.

A. In 1928, the U.S. Navy made plans to officially adopt the .45 ACP Thompson submachine gun but requested a few modifications from the original Model of 1921 design.