What I don't understand is owning more than one AR-15. Isn't the point to have a modular weapon, one that you can change to suit your needs? You should be able to own one lower receiver and as many different barreled uppers that you may desire.
Right now I own a Colt SP1 Carbine and an extra Colt government barrel attached to an A2 Upper. Old-school, for sure, but they are in almost new condition.. The only reason I still have it is because its a Colt.
Since I have an AC-556, I really don't shoot my other .223's. Now, my AC556 is too valuable and .223 ammo is too expensive - I need to re-evaluate....or maybe not.......Ehhhhhh, time to buy another 9mm pistol!