The Armalite is the way to go.. Early ones were distinguished by their almost orange stocks..Later Armalites have a brown/black/green swirled cycolac stock..
Charter's version is not bad, but the finishes were frequently a poor second to the origional..
The later versions I have little regard for, as they got away from the steel tube/aluminimum outer jaket barrel construction..
The BIG problem with ANY autoloading.22 is the magazine, and the hoardes of absolute junk AR-7 mags have done much to sour many shooters on these neat little rifles..Personally, for the two AR-7's I have gone through eleven magazines, just to have two absolutely reliable mags per rifle..
Once some good mags are obtained, these are very reliable, and reasonably accurate little rifles..
I found an Armalite early production, very good to excellent condition in the box with papers, and three mags for 125.00 at the Phoenix SAR show.. A little legwork on these will save you a LOT of swearing later..
Good luck-
Meplat-