The Auto-Ordnance Model 1927 A1 Thompson is a semi-automatic rifle closely patterned off the 1928 A1 "Chicago Typewriter." This faithful reproduction sports the iconic details of the time-honored Thompson. It is chambered in .45 ACP and - in classic Tommy Gun fashion - accepts a drum magazine. Now you can own a Tommy gun without having to sell a kidney to afford it! This 1927 A1 comes with one 50-round drum magazine. Get the best bang for your buck when you get a Certified Used Firearm. When you see the Certified Used stamp on any of our firearms, you can be confident that you're getting exactly what you want - a gun only in very good to excellent condition and held to the highest quality standard. All Certified Used Guns come with a 'no questions asked' return policy.