I'm pretty certain that chrome lining started out partway through 1951 and all were chrome lined in 52 plus. It's possible that with continued use the chrome lining has worn away entirely.
I'm no expert by any means but thread after thread in this forum has taught me that all ruski sks's were chromed starting midway through 51. Maybe you have a yugo? Try posting some pics.
I'm no expert by any means but thread after thread in this forum has taught me that all ruski sks's were chromed starting midway through 51. Maybe you have a yugo? Try posting some pics.


















































