There are a lot of look-alike or clone products being sold today that are not produced by HK. Here are some important markings to look for:
German export law requires that “Made in West Germany” or “Made in W. Germany” or “Made in Germany” appear on the firearm. This usually appears on the magazine as well and reads:

Made in W. Germany
HK Inc.
Trussville, AL or Columbus, GA
Older models may say Sterling, Chantilly or Arlington, VA or indicate SACO as the importer. Any other product not marked as above is not an official HK product and is not covered by HKI’s warranty.