I have this brake on my SCAR 17s. It performs very well by itself, pretty similar to the stock pws brake. I originally installed a phantom 7.62 QD flash hider when first bought the rifle. There was a noticeable increase in recoil and muzzle rise from the flash hider. When I installed the YHM QD muzzle brake it made the SCAR enjoyable to shoot again. I think it's a great muzzle brake, and I have second one on order for my Colt 901.