I got a somewhat rough 39a, though not in as bad shape as yours. Broken firing pin, missing the cartridge guide, rear sight and pin to keep the magazine tube in place. Parts are available from Brownells, and fairly reasonable.

After some fitting of the firing pin to get consistant ignition and adding a setscrew for trigger overtravel it is probably our favorite 22rf.

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The only problem is getting it out of my boys hands long enough to shoot it.

They aren't making 39a's like they used to so IMHO they're worth whatever it takes to put them back in action.