Apparently there were sub-variants of these. Brother says he had a 13-22 that self cocked on the opening of the sliding breech cover, with the one piece grip frame. I haven't seen one of those yet. The only differences between my gun, and a first variant was the breech and rear sight. On the first variant I have, both the breech and rear sight base are blued steel. The piston rod on my first variant was steel, with and oil pad around the front of it...
I suspect the hammer spring on mine to be slightly "compressed" :P Gun retains air on just 8 pumps. Trigger spring has a milled steel insert that sits on the end of it, with a slot for the end of the sear.
The valve stem that was in this gun had some kind of badly deteriorated sealing material in it- I hasve no idea what it was. I've been tempted to try some tiny o-rings for a stem seal, but have never found any that small. I'll have to dig for the valve and stem to get pics...
Regards,
Doc Sharptail
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