All Korean KS head stamped M2 ball is CORROSIVE primed. If you shoot it you have to clean your rifle ASAP. In the M1icon that means a full take down to clean it or else. Easy to clean up bolt actions using it and it shoots quite well. The Iranian is listed by SAMCO who imported it as being NON CORROSIVE but I don't think I would take a chance with that and would test it to be sure before shooting it in the M1.
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