I discussed this with Wilson Combat recently ...
and they assure me there is no potential damage or premature wearing of the barrel ...from brushing the bore with typical bronze brushes.
They make barrels for 1911s, right?
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.