Eugene Stoners AR180 is a neat little weapon,
While it solved several AR15 shortcomings like an improved tappet rod that moves the gas system out of the action and into the handguard, a cocking handle that doubles as a fwd assist, side folding stock and heavy use of stampings instead of casting to reduce costs its shortcomings (IMO) are less robust design, flimsy stock and although AR 18 magazines work in the M16/AR15 ,
AR15 magazines do not work in the AR18/180 without being modified.

Original Costa Mesa made guns and short barrel versions are very desirable,
Production supposedly moved to Howa Japan then to Sterling England (where the IRA managed to procure them).
Interestingly AR18/180 internals are almost identicle to the current British Light Individual Weapon LWI bullpup .