It seems that the “trade-dress” arguments are back and going to court again, here’s a quick rundown and link sent in by a reader:
If you remember the "trade dress" case between Colt and Bushmaster in America from a few years ago, there’s a similar battle going on now between HK and several other companies, including Crosman, Gamo, and Precision Airsoft.
Full information available at http://www.ar15.com/forums/topic.html?b=1&f=6&t=869353
I’ve checked the forum link and there’s a link to the very dull case papers which you can read if you’re interested. There’s a simple explanation of what’s going on on the ar15 pages linked to above.