I dunno why you want or need muzle brakes on either of those rifles. Neither one is much of a kicker in those calibers.
Adding a muzzle brake or Magna-Porting will greatly increase sideblast and noise.
As for removing the front and rear sights and installing plug screws, you can do that without a gunsmith. It's easy. The screws are readily available at gunsmithing supply stores or by mail order. :shock: