This is the closest you'll ever get to owning the infamous HK UMP 45.  A commercially available option to the common USP 45 conversion kit with a lifetime warranty and no time consuming and costly SBR process.  This pistol is ugraded with a German spec HDPS barrel, authentic HK UMP 45 (FBI) lower, SB tactical brace.  The GS45 "pistol" is the most authentic and easiest way to own an iconic firearm.