After looking into this a little further. The h&k magazines can only be purchased in the law enforcement/military side of the website. Other websites have mags on there that are virtually the same but not exactly. My guess, it is put on there to appeal to whatever group they're targeting. It is kind of funny to see that you can only purchase these specific mags by clicking the link right below the grenade launcher link, but hey, I can't complain, they're frickin nice mags.