Supernova issue

[Bailey toma]

New to the forum I don’t know if this has been discussed or not but I recently bought a supernova and just cleaned it for the second time and noticed the bottom rails where the bolt slides seem a little marred up don’t know if this is totally normal or if it’s a issue any knowledge would be appreciated 

[Major Woods]

I have 2 Supernovas and 1 Nova, that is normal.

All 3 of my guns have varying degrees of it.