The Schmeisser MP-28/II (another variant of markings is M.P.28.II) submachine gun is a post-WW1 evolution of the first practical submachine gun, developed by designer of the MP-18/I. MP-28/II was produced in limited numbers in Germany by C.G. Haenel company in Suhl, for police use; it was also produced under license in significant numbers in Belgium, by Pieper, and sold to some South African and South American countries, and also to China, Japan and Spain. MP-28/II was basically the same weapon as MP-18/I, with minor improvements such as added fire mode selector and tangent sight. Another difference was availability of different calibers in export models, including 7,63x25mm Mauser, 7,65x22mm Luger, 9x19mm Luger, 9x23mm Bergmann/Largo, 9x25 Mauser export and even an .45 ACP (11,43x25mm). Belgian Army adopted M.P.28.II in 1934 as Mitrailette Modele 1934, in 9x19mm. The M.P.28.II saw significant use during Spanish Civil War of 1936-39.
M.P.28.II submachine gun is blowback operated, selective-fire weapon that fired from open bolt. Tubular receiver was attached to the front of the wooden stock, and could be pivoted barrel down for maintenance and disassembly. Magazines are inserted from the left side, ejection is to the right. Manual safety is made in the form of locking cut, made in the receiver, which engages the bolt handle to lock bolt in open (cocked) position. Fire mode selector was made in the form of cross-bolt button, located above the trigger. Standard sights consisted of blade front and tangent rear sight, marked from 100 and up to very optimistic 1000 meters.