I think it is the "Magnum Research'' Desert Eagle gun they were only made for a few years I can not find the link that I saw the other day I think it was manufactured around 1992 1993.
I was looking up a gun that was in the pawnshop I thought I had found a great buy it was a blued one and they wanted $150.00 for it. I passed after researching it. It did look like the other 22 autos on the market S&W Ruger. The blued one retailed for $250.00 if I remember correctly. I did not see anything on the stainless gun you are talking about, it might be a collector item.
Is this it? This one is called the mountain eagle but it looked like this
I passed because of the limited production on them and decided to get another Ruger.
Dave