AR-180B. Plastic lower, no longer produced and has a tendency to crack at the pin hole. No problems when they were still in production, Armalite stood behind the product, but IIRC, they're now out of 'spares.' So, break one and you are screwed. Only reason why mine found a new home.
If NEA were to reach a deal with Armalite to license a billet aluminum model or to come up with their own adaptatation, I'd pick up one. ArmedSask machined a clone that turned out really nice.
I was getting 1.5 MOA with handloads. 2-3 with factory AE 55gr FMJ. Plenty accurate for a 'black rifle.'
I still wouldn't trade 2 for 1 for any of my Swiss Arms though.

(Yeah, I drank the Swiss Koo-Aid the last time I visited Bern)
In terms of quality, the Swiss Arms beats the Armalite, no question. I've also found all of mine to be more accurate as well.
They are heavy, however, so if you're 'weight sensitive,' might not be the best rifle for you.
The Shooting Edge, the original importer/distributor always provided outstanding support and with NEA now bringing to market a line of Swiss rails, accessories, & Canada Ammo's 'cheaper' mags, my choice would be the Swiss Arms.
Prices for used Armalites in the EE are getting pretty ridiculous as well, so I'd hold out for a used XCR or HK SL8 if you're on a budget.
Keep in mind too, that at times, great deals can also be had on good, used Swiss Arms rifles as well. Just ask Otokiak. IIRC he picked up a BlueStar for something like $1500.
I found mine for about $500 more. Alas, the others have been purchased new from TSE, but watching how the Canadian dollar was doing, I still managed to save hundreds on each, as retail price were adjusted up/down on new shipments.