Load up an additional magazine or two and enjoy firing your Thompson replica longer between breaks. This factory replacement Thompson magazine from Auto Ordnance guarantees an excellent fit and reliable operation. The 20-round magazine chambered in .45 ACP is manufactured with not only the same materials as the original magazines, but is additionally crafted to the exact same specifications and tolerances. Fits Thompson T1, T1B, T1SB, T1BSB, T5, T1-C, TA5, TM1, TM1C, M1S