I have a HK factory UMP 9mm bolt, barrel and magazine that I have reluctantly decided to part ways with to raise cash for another project. There were only a handful of factory UMP 9mm conversion kits out there. The barrel length is 7.87 in and is marked with the appropriate HK 9mm roll marks. The parts are all in excellent condition. If you are wanting the real deal for an HK UMP 9mm, this is it! All NFA rules apply.