It wasn’t too many years ago that consumers had only 2 readily-available semi-auto .223 rifles available to them: the AR15 and the Mini-14.
Today, the marketplace offers plenty of alternatives to the AR15 platform. Even if you leave the AR15 piston conversions off the list, there are lots of choices.
First, the original alternative, the Ruger Mini-14 (now available in Evil Black flavor):
Robinson Armament offers 2 models: the M96 and the XCR:
HK no longer offers their HK91/93 models, but they do have the HK416-derived (and piston-driven, mostly-AR15) MR556A1 as well as the funky-looking SL8-6:
FN offers the SCAR16 as well as the chunky bullpup FS2000:
Kel-Tec offers a few versions of their piston-driven SU-16:
Steyr now offers the AUG for civilian sales:
If the Steyr is a bit too rich for your blood, MSAR offers a licensed version (STG-XM17E4) for less cash:
Gun Tests has run a bunch of these through their paces. Other magazines have reviewed some as well. Google around and you will find plenty of opinion on these guns.
Armalite no longer offers the AR-180B.
Bottom line: there are a lot of options for Evil Black Rifles.