It IS a misprint. Way back when HK-USA had their own forums page they stated time and time again that it was a manual misprint from when the P2K/P30 manual was adapted to the HK45, but no matter how many times they said it, or how many times it has been said here, the topic is worse than a zombie, it won't die and you cannot kill it. People just keep hoping against hope that there is something to it and no matter how many times they are told there are no plans for 15 round mags in .45 to be made, they refuse to believe what they don't want to believe.