>>508155160
there's one called the SF5 which is a 3d print of the HK MP5, but using the AR15 trigger assembly since its much more readily available and cheaper

i was about to make one till i saw it required me buying $1200 to $1500 worth of parts from HK.

man, im not that into it. You can make yourself a 9mm American MP5 for cheaper and better. Radial delay locking breech instead of roller delay