Wish I could help you, but I did get to shoot one at the range a couple of weeks ago. The guy was a stranger to me, but was kind enough to let me try it out. It is a lot of fun. Quite heavy too.
GSG does a good job on ALL their replica .22's. Even have the same weight almost of the originals. I had the MP5, but had to sell it. NOW....I* can buy one for less than I sold my older one for...hahahahaha It was very accurate. I will be getting another one, but with a sliding stock from the factory this time. And I might get a STg44 also.....