Yep - every semi auto that uses the browning tilt system has some wear there. Its very minor. Don't worry about it. The tennifer is still in the molecular level at the surface. So, U are still protected.
I am super anal retentive when it comes to the finish on my guns. I've had friends tease me about my "museum pieces" - and with some of my slides hard chromed, I need not worry about scratches anymore.
But, even on my Walthers, I didn't bother to refinish the barrels. U will get wear there, and on the top and bottom of the barrel itself, near the muzzle. They all do this.