The DHS thing is for FLETC, and other agencies are hopping on it. It's not that insane of an order. All federal law enforcement go through training at FLETC, and that includes shooting. It's bundled for cost savings, and to get wookie suiters in a tizzy.
This, and the contracts are all already in the pipeline.
And since the lion's share of it was in .40, shrug... I don't really know how much it would affect supply or manufacturing capacity for everything else, unless it's taking entire machines running other calibers out of service and having all their dies replaced to stamp/shape/load .40.
The logistics of that are something I'm not really sure of.
One thing I'm hopeful for is that for a "blip" like this in demand, a smart business won't go ramping up capacity future years won't support, but perhaps they
will modernize or upgrade the existing capacity. Again, no idea if ATK and their ilk are doing so, but it would help with other supply chain interruptions, faster machines, maybe newer tech etc. less breakdowns etc.