Always liked the Mini best. Many, many, many moons ago I worked for a company called Vector Arms assembling parts kit semi-auto AKs and Uzis, though the company also did HK style roller delayed guns and semi-auto RPDs, but I wasn't part of those lines. A customer had a transferable select fire Mini Uzi and had bought a closed bolt kit for it, and he had us do the conversion for him. I got to install all the parts and test fire it. IIRC a normal open bolt Mini has a cyclic rate of around 700rpm on full-auto. Enough that you can hear the individual shots. With a closed bolt I believe it jumps up to around 1200rpm. Much like the MG42, if you hold the trigger down it's basically one long "BBBRRRRRTTTTT" sound. When I test fired it I loaded a 20 or 25rnd mag (can't remember because it was twenty years ago), stuck it in the bullet trap, worked the charging handle, and rode the lightning. By the time the first spent casing hit the shop floor the final round had already been fired and was in the air. Not very practical, but fucking fun as Hell.