When the first AK "pistol" came to the market, it effectively banned the importation of any 7.62x39 steel core as it is illegal to sell pistol AP ammo in the US. The most common steel core 7.62x39 on the market at that time was very low cost Chinese Norinco.
Now that this Norinco steel core ammunition is relatively scarce in the US, some people attribute it as something special and truly AP.
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