Auto Seer. That's a couple few years in FPMITAP should the 'Not ATF' dude start sniffing around in places they shouldn't be.
Discussion
Got it, thanks. Just read that for the drop-in auto-sear to work in the AR-15 you need an M-16 hammer, disconnector, trigger, selector switch, and bolt carrier.
Interesting topic. Too bad we can't get guns in Europe 😑
It's amazing what a little information can do to improve one's mood and outlook. :)