Two of my Mosins wear glass.
A shot-out battle hardened M38 has a cheapo mount and an NC-Star scope which has held up surprisingly well, but it's not exactly quality.
My M91/59 with pristine barrel and gorgeous wood has a Darrell's mount with a Burris 2.75x20 scope up top. Yes, I realize that scope and mount together cost 3 times what I paid for the rifle. Yes, it is worth it. I handload for this rifle and shoot 1-2 MOA w/o much trouble, which is certainly saying something for a Mosin.