Magazines are the weak point in the AR-7 design. If the catch notch is worn, the feed lips sprung or the feed ramp (the tab at the front of the mag) is bent, the nose of the bullet will hit the barrel and not the chamber. Most AR-7 magazines have little pinch marks at the front to guide the cartridge and the last two mags I bought have an external spring for that purpose (these appear to be the magazines shipped with the Henry Survival Rifle). Round nosed bullets help, and carefully removing sharp edges from the chamber mouth may help (very slight radius). If this sounds like a FORD (fix or repair daily) or range toy, that's my impression.
Plus the bolt and springs are heavy for a .22 LR implying you need fairly powerful and consistent ammo (not bargain bulk pack). I have an early AR-7 by Armalite of Costa Mesa and use nothing but CCI Stinger in it.
Charter Arms took a while to make decent AR-7s (early bad production however toasted their reputation beyond recovery). Most of the Henry Survival Rifle version appear to be an improvement.
Still, I would recommend a Marlin 70P Papoose, the 19" barrel Marlin Model 60 or a Ruger 10/22 as a primary "truck gun", even though I have often taken my AR-7 to the mountain as a secondary gun.