building AR's only takes a few minutes. great modular weapon system (I have them in 5.56, 6.5 grendel, and even 50 BMG). minimal tools are needed, no 922r issues, just some $$$ and a little time. every now and then people bring them to our build parties for a little help and I have them up and running in no time at all.
and the best part is it's really hard to screw it up... lol