Throughout much of the Cold War, Mosin-Nagants weren't exactly rare, but certainly not as widely available as they are now. Then in the 1990s and early 2000s, the Mosin Nagant flooded the market.
Total production of the Gewehr 98 by the end of the First World War exceeded five million. While not as common as even a decade ago, it is hard not to find a Mosin Nagant at the local gun show.