What are the two meanings of brake?...
Break
verb 1. separate or cause to separate into pieces
Like it does to the column of escaping gas. Muzzle break.
: a device for arresting or preventing the motion of a mechanism usually by means of friction. apply the brakes. took his foot off the brake. 2. : something used to slow down or stop movement or activity.
as in a muzzle brake
Dealer's choice I guess...