i had one threaded onto my dissipator, its just like the wilson brake but a different company. anyway, i noticed a big difference in muzzle movement.
in the prone at 300, that darn front sight post hardly moved at all. my buddy has the same rifle with no brake and also noticed a big difference. im happy with it and glad i had it done. only problem, after i shot my AR, i went to the mauser and had the sh*t pounded out of me! my little black buddy spoiled me