5KU 14mm Negative Mini Breacher Muzzle Break for Airsoft Rifles

"Muzzle looks awesome and is well made, but unfortunalty it creates a weird air vortex and makes the bbs shoot all over the place! I was getting frustrated that it was my gun so i put it on different gun and it did the same thing until i took it off. I am going to try and dill the end hole out and see if that fixes it. Do not buy unless you have the ability to modify it.