There are many ads on Used Guns and Oz Gun Sales for new and used Buck Marks, and most of them don't seem to move at all.
I used a club member's old and slightly rusty Buck Mark a while ago. It was pretty accurate, but its unusually strong magazine ejection took me by surprise. If you aren't prepared for how quickly the magazine shoots out, it will likely bounce off your receiving hand and end up on the floor.
Is there something wrong with the Buck Mark compared to other rimfire pistols on the market that I'm unaware of?