I had two at the same time (1992), My first id found behind the seat of a junked out truck that was sitting at the dump the other was given to me by a coworker, one dump find functioned just fine with certain types/brands of ammo, the other that was give to me was horrible, it didnt matter what mag was used, yes they are temprature sensitive (Nothwest Alaska they dont work that great). they work ok at short distances when its warm out (40yds MOA coffee can) in a plinking situation, I'd find it difficult to recomend one as a survival gun.
in the end I traded both Ar-7's for a single shot Iver Johnson 12ga, for small game hunting, which I later on traded it and a old western Auto 30-30, for a Springfield M-6 scout in 410/.22lr It was horrible and I was able to trade it off for a decent quality Ruger .44mag carbine (best trade ever).
id say for a light weight .22 get a Crickett bolt action singleshot .22, or for a decent hunting .22, get a Browning SA-22 and never look back.