Never had any feed/fire/cycle/repeat until empty trouble with Nylon 66s and any 22 LR ammo that wasn't Russian Junior brand. OTOH, I've never had any detachable magazine fed Nylon 22 that was as trouble free. Those magazines might work fine with a manually cycled bolt gun, but they are a hit or miss proposition when used with the Nylon 77 or Mohawk 10c.
