you must mean the rifle that aa arms had, if its got a 16" barrel and folding stock.
the rifles are rarer (in my experience) than the pistols. i had both the pistol and the 'mini' version. minor jamming, not terribly accurate, probably because i was a nuub to shooting and its horrible trigger.
supposedly aa arms even made some selectfire versions, but only for LE to play with.
for a 'shiggles and gits' type of gun, its probably a good buy. should want to fully inspect the internals though, make sure nothings worn or broken or missing.