There's something going on with Karl's website.
Last night when I was playing the above link from a Linux laptop, I was redirected to some crummy .tk website claiming that I was infected.
This morning on my work Mac, I was trying to get to http://blog.krtraining.com/muzzle-direc ... -a-reload/ for the upcoming class - and got a similar page.
Now, still on my Mac but in a Windows VM, I went to the first link and I get this:
