I like the picture of the guy holding up the AR-15 from the buttstock with his pinky. We used to do that with the bayonet lug with M16 A1's on a daily basis at the Parris Island school for wayward boys and girls.
I doubt that would qualify as an HBAR in MD, however. Going to need a much bigger and longer comp on the barrel as that weight is going to make the 5.56 kick like a .308. Like shooting a 6# magnum rifle. Having built AR-22s at 3 lbs. even I guess its possible. I don't consider a 2 MOA AR as very desirable or a fixed stock you can't personalize to the length you want at least.