I would be annoyed that the list of available guns includes nothing I own or have a lot of familiarity with, so I'd likely take the Glock 19.
I don't care for Sig pistols at all but I know that they have quite a following and are very well known as a phenomenal design. However, with what I have seen out of Sig in the past few years, I'd want THAT 226 to be a handful of years old before I rolled the dice on it.
Also, I'd be awfully curious about the ammo that I'm being forced to swallow (since obviously, I'm being force-fed this short list of guns I certainly didn't choose) and you can bet that I'd be grabbing one of the .45s if the ammo was all FMJ stuff.
And since this is obviously just a fun little "I MADE THIS UP!" scenario and I'm being pushed toward a threat against my will and with a small array of handguns I did not choose, I'm going to stuff as many of them in my belt as I can, and if I'm going to Mexican carry, I'd probably take a DA/SA over something striker fired to place on my person without a proper holster.
And when I run out of space because of all the handguns, and one orphan gets left behind, it'll be that ugly HK with the ammo stuffed in to the magazine backwards because they suck and I hate them.