The Gen 2 Series of brakes started where the Gen 1 left off.  American Precision Arms Came up  with a solution for the shooter that has been a gamechanger.  The Gen 2 has a nut that is a separate piece.  This allows our customers to install the brake themselves at home.  Installations take about 30 seconds and have no hideous crush washers or peel washers to deal with.  Additionally, competitive shooters can easily remove this brake for cleaning or simply to move if from barrel to barrel.  Competitors can burn through 6 barrels or more in a season at times.  This means less money spent on gear and with your smith.  To the gunsmith it means no hassle indexing a brake.  Simply thread to spec and go.