Just came across this topic - I actually just ordered the Umarex MP5 22. After some back and forth with the dealer they were able to sell it to me (should be arriving tomorrow at my FFL!). They had to take the collapsable stock off the rifle and send it with the fixed stock that I ordered. Also, since they did not have a 10 round magazine, only a 25 round one, they could not ship a magazine. I also called the NJSP firearms division and spoke with a detective there who said as long as the stock is pinned or replaced with a fixed stock, it will be legal in NJ.