I really REALLY dig that mod. A little filing or sanding would help restore the look of texture, and make it look more factory.
I've wondered myself why glock doesn't incorporate a rail into the 26/27, but on my CCW gun, I have no use for a rail anyway. Not to detract at all from your setup, awesome.
I don't always rock out with my glock out, but when I do, it's all the way.