I bought mine to train my nephew without much recoil, because I could afford to let him shoot as much surplus ammo as possible.
I have had no trouble with extraction or barrel heating up excessively , shoots about 7/8"-1-1/4" with surplus. No damage can be done as long as you scrub the barrel good after use.
Best rifle I ever bought, shot about 500-600 surplus and 100 factory and 50 reloads threw it and looks as good as the day I got it.
Made my nephew into one hell of a shooter at 14 years old, shoots better than most adults!
The only thing I wish CZ would build a rifle length barrelled gun and put a way better adjustable rear sight/peep from the factory, my only complaint.
Dale Z!