Brought back memories. I had an AR180 back in the late 70's and early 80's. One rifle I truly regret selling
Popular gun with the IRA as I seem to remember. Three different types were manufactured: A few in Costa Mesa, CA, some by Howa, out of Japan, and more by Sterling in England. In a lot of ways was really a blend of an AR and an AK. With that folding stock, it was small enough to shove in an internal frame backpack. Scope mount worked as advertised, and with M193 ball it was pretty accurate, and very reliable. You had to adapt AR15 magazines though by making a dremel cut for the mag holder to engage.
I regret selling it, but at the time I was just married and needed the money. Armalite modified it and brought it back, but by then, AR 15's had taken over that market niche.