"To the Jews I became as a Jew, in order to win Jews. To those under the law I became as one under the law (though not being myself under the law) that I might win those under the law. To those outside the law I became as one outside the law (not being outside the law of God but under the law of Christ) that I might win those outside the law" (1 Cor 9.20-21).
Here we have three situations:
1. Under the law, meaning Mosaic law (i.e. Jews)
2. Outside the law, meaning outside the Mosaic law (i.e. Gentiles)
3. Not outside the law of God but under the law of Christ (i.e. Christians).
Christians are in the third position. We are not under law but not without 'law.' For the Christian, God's law no longer equals the law of Moses, but the law of Christ.