My dad had one of the original Armalite models. This was probably in the early '60s. I shot it some, but it's been a long time ago. I seem to remember it was surprisingly accurate for what it was. Very awkward gun, too light and the huge buttstock was way out of proportion for the rest of the gun, but it had to be huge to hold the barrel, action and magazine when the gun was broken down. Plastic stock finally developed a big crack rendering it worthless.
If memory serves, the originals were chambered in .22 Hornet.