I don't know if the CM9 is the best for concealed carry but it is very good and satisfied my need for a pocket/compact single stack 9mm that is reliable and is shootable. It is also reasonably priced which is always nice
Jim's Rules of Carry: 1. Any gun is better than no gun. 2. A gun that is reliable is better than a gun that is not. 3. A hole in the right place is better than a hole in the wrong place. 4. A bigger hole is a better hole.