Yes I have Bill, and they work great.. I know how my air rifles shoot and what pellets they like best. So I have been testing each and every one on the guns I make them for.. Today I made a new muzzle brake and shroud for my newest S1K .177.. Sat down at my bench and fired of 10 shots at my target which is 40 yards out and was getting my regular 1"groups with it..

And also I put my newest muzzle brake on my QB78T .22 and wanted to see how it effected the accuracy.. Well I tell ya, rarely ever stand and shoot.. But I thought I would try it but new I would never hit anything I was shooting at..

Low and behold, I aimed at the reflector down at the end of my driveway and hit id dead center... I was surprised and madd at the same time.. lol.. Now I have to replace it..

.. But, Bill the brakes are working fine and I do not notice any problems with accuracy at least out to 40 yards...
Gene