Casualk98collector
Active member
Help a new guy out...what are the big differences between a BD38 and a MP40? I do a lot of building myself and have wondered why the MP40 was never made in a semi auto (in 9MM, in appreciable quantities) I know the conversion to closed bolt, striker fired is what holds most all these designs back. (Take the STEN for example. There were 9 bazillion parts kits imported, but never a commercially successful design.) Was it lack of demand, lack of design or ATF regs regarding SBR's? (The recent glut of 'pistol' sub guns like the PPSH43 were only due to a rather loose interpretation of 'its a pistol if its short and cant be shouldered (very loose paraphrase there))