The idea of the federal government protecting the rights of anyone except a "protected class" is just laughable today. If you aren't a parasite Washington just doesn't care.
Aero Precision M5 uppers are dpms high profile and work with high profile rails. I have them now on three builds. The trick is to find the high profile rails as they are getting harder to find although I have found some very inexpensive rails that work very well on that dreaded auction site. I do notice a bit of a challenge with the takedown pins but then I am using off-brand 80% lowers. After several takedowns and cycles they do loosen up.
I used an Aero M5 upper with a Blitzkreig 80% lower on my .338 Federal build. Fits and works perfectly. Keep in mind that an Aero M5 upper is a DPMS high profile so you need to consider that when choosing a handguard.
Yes, but this one has a bit of a different slant and you saw the Thomas and Gorsuch dissent on the last one. This one could be construed as being the first step in taking guns away or outlawing the ownership of guns.