New WZ-48

I bought a WZ-48 .22 LR Polish training rifle at the Great Falls gun show on Sat. Shot it today and was very surprised at the groups. Off sand bags I was able to keep all the shots in a hole the size of a quarter. The rifle is so heavy that the first shot I didn't know if it even fired or not. There is no recoil and with hearing protection on I could hardly hear the shot. Seems like it is going to be a fun gun to shoot.

The only problem with it seems to be a rough chamber. The fired round sticks and when it does eject there are deep scratches on the case. Is it easy to clean up the chamber without damaging it? Or is it something a gun smith will have to do?