I got the gun back today. According to UMAREX, they had to replace the trigger d/t faulty manufacturing... With that said, I am slightly impressed with their turn around time, but, I still wish I hadn't had to deal with it. I haven't shot it yet, but they say "multiple rounds fired, no FTF/FTE." And yes, finally, when mag is loaded it does click. Hoping to get out there this weekend. I'll keep you guys up to date. Maybe if I can figure it out, I'll post a video.
Also, while we're on the subject of H&K... Anyone seen a 416 (5.56x45) converted to civi standards? Or even a 9mm MP5?