No brake. Have been using a sled to minimize recoil but could be affecting harmonics??? I'm open to any suggestions.....not throwing the towel in on the rifle...could very well be me but shooting has been my passion for several decades and as I said, my other rifles are shooting very well. Did a very thorough cleaning since last outing and have not tried the AB's since then. Did pick up the bullseye camera system because I do want to shoot long range but if I can't get 1/2 MOA @ 100yrds, what's the point?