45 Cal Semi Auto Thompson M1 Here Is A .45 Caliber Semi-automatic Version Of The World's First And Most Famous Military Rifle. The Thompson M1 Was Used Victoriously In Battles Throughout The World, Inscribing Its Place For All Times As A Legend Among Military Firearms. We Offer The Same Attention To Craftsmanship Today That Made The Original So Highly Regarded. The Look And Feel Are Authentic, Right Down To The Side Bolt Action. The Frame And Receiver Are Milled From Solid Steel, The Wood Is Genuine American Walnut And The Overall Finish Is Blued Steel.