hey guys maybe someone could help with on this forum I am looking to build a semi auto MP5 sbr, I completed a mp5k and am now moving on. As much as I would love to get an original hk I think my wife would leave me over the cost, so I guess I am asking for some options, I have been looking at some aftermarket pistol guns that I could convert but it seems like there are a ton of them out there. does anyone know what company to use and what companies are as close to factory as possible?