MCEM-2 (Machine Carbine Experimental Model 2) submachine gun was produced only in prototype form, but it is worth to mention by the simple fact that it is one of the very first submachine guns to combine wrap-around bolt and magazine in pistol grip - features, later copied in the Czechoslovak Sa vz. 23, Israeli Uzi and a great number of other submachine guns. MCEM-2 was the second prototype in a line of experimental submachine guns, designed in Britain in 1944. It was envisioned as a possible replacement for the STEN submachine gun then in service. The MCEM-2 was developed by Jerzy Podsedkowski, a Polish constructor involved in work on Vis and Mors, who fled from occupied Poland to Britain. It is believed that prototypes of MCEM-2 were made before the end of WW2, and its derivatives MCEM-4