I TOTALLY agree with dillinger and robocop-muzzlebreaks on a .22LR-especially on a "bull barrel" are a useless gimmick simply for making more profit. I cannot think of a single reason to have 1 on rifle heavy rifle barrel chambered for .22LR.
The only cases I can think of where one would be effective in 22 LR would be on
a rapid fire or steel challenge pistol. Worthless on a rifle, even a really light one.
Not enough gas pressure left at the end of a 16" barrel to work the comp.