I’ve got the AR-556 and love it. It’s a machine...a tad heavier than a Colt but all the dirt stays up front with the piston and the bolt carrier group stays purdy as a picture.
Nice. Got an email from Ruger this morning featuring this piece. If it came with 30 rd magazines I’d probably get one but since it only comes with 20’s I guess I’ll have to pass. LOL!