I got it used when I turned 12 and started hunting. I do think it was tight then but not this bad but that was 15 years ago now. It has been real bad for last couple years anyway. I did pull trigger group out and clean it ( not as dirty as expected)
With that out I can see that it is tight side to side on the mag like either mag sides need filed down or may well needs opened up. I don't remember dropping it or anything that would cause it to pinch closed. Also it is harder with full mag than empty.
Side note one mag the previous owner had. My second was purchased couple years later. But same problem with both.