My very first .22 rifle, age 13, was a JC Higgins model 31 by High Standard. On the farm as a kid I shot "at" a lot of crows and missed them all. Grandpa had guest hunters from the next state over who did squirrel hunt and who proudly show me their bags full. There were about 40 acres of woods on the farm, plenty enough for good squirrel habitat with all the grain droppings they could find. The weakness of that rifle was the rear stock attachment to the receiver and eventually it broke off.
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In order to preserve the rifle, I cast a resin handgrip and added an aluminum plate for a butt stock. The recess or dip in the stock makes it very comfortable to bring up to align the crosshairs and the hand is in a good position for trigger squeeze. The grey plastic pieces are just 3/4" electrical PVC slotted to slip onto the 1/8" thick aluminum. I never altered any mechanical part of the rifle, just made a new stock, so I think I'm safe in doing that. It sure made a more functional rifle from a family heirloom piece that is now 67 years old. That's a nice REX 4 X 32 AO scope, cheap, but just right for this application.