Hello all. I recently purchased a Mosin Nagant M91/30 off J&G Sales. It is in really nice shape for a 1926 rifle. Problem is I have the sticky bolt syndrome. When I get the shell to eject (beat on bolt with my hand) there are pretty big scratches on the casing. That has to be some type of burrs. I was reading that taking a rounded file and lightly running it over the edge of the chamber will cure this. I just would like some advice from others that have had sticky bolts. Thanks.