For what it's worth, the AR-7 was designed by Armalite as a civilian rifle. It is similiar in concept to the AR-5 which was officially adopted by the USAF as the MA-1, but never put in production. The AR-5/MA-1 was a bolt action 22 Hornet.
Some of the earlier AR-7s wern't particularly reliable unless tweeked. This might include judicious minor bending of the magazine feed lips, slight chamfering of the chamber mouth and/or lubrication.
I've also heard the Henry units were more reliable than some of the earlier ones.
"There is nothing so frightening as ignorance in action."