I like the look of the MP5, but the price and the fact that I can't legally own one with the short barrel has led me to purchase the next best thing, the GSG-522. It is manufactured from German Sport Guns in Germany and imported through American Tactical Imports.
I've been doing some research/reading on forums and ordered replacement and upgrade parts. HK had completed a lawsuit with ATI/GSG and as a result, some things about the GSG5 had to be changed. Following an online video, I changed out the screws/nuts hardware on the trigger assembly, upper and the bolt. I also used some blue Loctite on the fasteners.
I converted the GSG-522 over with parts for a GSG-5 such as the front sight, charging bolt and handle, mag release and stripped lower. I added an Uncle Mikes contoured grip, actual MP5 push pins and rear sight, charging handle buffer and TruGlo styled front sight. I have other parts not on the rifle such as a foregrip, fake suppressor shroud and collapsible stock.
Took the rifle out to Alpine and had a blast. No problems thus far after about 300+ rounds. The iron sights are way off, so some type of red dot sight will be on order in the near future.
Anyhow, that's about all I can think of for now, enjoy the pics.