*****
It might have been one I had as a kid. That's the reason I got rid of it. I can't remember the model number, it was tube fed and had those weird slots on the left side of the receiver directly behind the chamber.
I'll be damned. Big ol' heavy thing - as .22s go - right? The bolt handle could be pressed inward to serve as a bolt lock while cleaning? The left side slots are opposite the ejection port?
I had one that went full-auto as well. Never could figure out the problem, but I found the problem was worse if I loosened the stock. Eventually I gave it to my cousin (who swore he could fix it) and moved on. I never knew that model had a propensity for that problem, though.
Good thing it was tube-fed; it was always the feed mechanism that eventually jammed it up and stopped the fun. I wonder if there was a version that used a box magazine. Hmmm... ;-)
It was accurate, just not very reliable. {Someone has done some "customizing" on this one}