Yesterday I noticed that the rear left metal guide insert was worn during my field strip. It appears to have a groove down the center of it that is inline with a groove along the plastic rail. Also, it appears that one side of the insert has more wear along the groove than the other side and appears a bit discolored. I am not too concerned with the groove in the polymer rail from posts I've read, but was wondering if this wear is normal or premature for a gun less than three months old.

The gun has 550 rounds through it now. I did shoot 20 rounds of Remington +P to test it out.

I clean and lube my CM9 after each use with Gunscruber, an air hose, and Safariland's CLP. If I err with lube, I may do so with over-lubing.