Thompson fans can now convert their existing TM or CYMA M1A1 Thompson replicas into the other variant, the M1928 which is available from Gunner Airsoft. This kit has a "sleek" configuration. To know the difference from the other, the M1928 features a charging handle on top, cooling fins in the barrel, and a Cutts compensator.  We wonder if a manufacturer would offer a drum magazine for this conversion. Costs US$190 as it is a full metal and wood kit.