SKS scraping brass off casing during chambering. Need help!

[u/No-Principle-433]

Just got this SKS. When chambering a brass round, it scrapes a big chunk of brass off the casing.
It happens right at the bottom edge of the chamber (circled in blue).
Is this normal? If not, how do I fix it? Thanks!

[u/Acceptable_Visit_115]

Shoot steel cased ammo.