What are smaller variants of the Israeli submachine guns that copied the MCEM-2's combine wrap-around bolt and magazine in pistol grip considered to be?
MCEM 2 submachine gun: MCEM-2 (Machine Carbine Experimental Model 2) submachine gun was produced only in prototype form, but was 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. MCEM 2 submachine gun:  23, Israeli Uzi and a great number of other submachine guns. Uzi: The Uzi (Hebrew: עוזי‎ , officially cased as UZI) is a family of Israeli open-bolt, blowback-operated submachine guns. Smaller variants are considered to be machine pistols.
machine pistols