Yes, installing choke tubes is pretty common these days. Thus the price has gone down as they've figured out how to do it better and faster(therefore cheaper). I'll sending off one of my double barrels this week to have them installed.

As far as Briley is concerned, they are top notch although a bit on the pricey side. But they do top notch work and have some excellent chokes. My number one choice for installing chokes in thin walled barrels.