Barrel rail for revolvers

[Velocity Villan]

I work at a well known custom gun shop as their (manual) machinist. When we customize revolvers, we add a rail to the top if the customer wants optics, but I was thinking, what if I just cut a rail into the actual barrel? These are pictures of my prototype.  If this works out, you might find these available for sale.

Well, I can't get the pics in the post somehow.