That is similar to the TacSol one I use on my 597. But those small holes do not help the shot timer pick up the sound of the rifle firing.
One other comp that works both for sound and the small amount of muzzle flip is the Allchin comp, which is designed for .22 pistol raceguns. He now has some specifically designed for .22 rifles including this one made specifically for the 15-22. I know they work because not only did they win my comp test on RFC they won the one done by Teamrimfire. com also.
15-22 Compensator - Allchin Gun Parts