I have posted a couple of threads on here about losing the accuracy on my AR 6x45 after the muzzle brake was installed. I have tried a lot of things in two months and could not figure it out. I finally decided to drive up to Cheyenne from Denver where Thunderbeast is located. I wanted to see if my brakes were installed properly. The shop foreman (sorry, I can't remember his name), looked at them and said that he would need to re-thread the barrel. The brake was on too tight and it needed to be installed properly. I had two other rifles that had the brakes installed by the same gunsmith and he looked at them. I left the rifles there and started heading back to Denver. I thought what he had told me and I was very concerned about him taking my custom rifles completely apart. I went back and told him of my concerns. He had already taken the AR apart. Doing so, he discovered that my gunsmith hadn't tightened the gas block and other parts. I was mad at myself because I really didn't want to spend a whole bunch of money. He called back later and told me he had everything back together and installed properly with all three brakes on my rifles. I haven't shot the rifles yet, but after dealing with Thunderbeast, I am very confident that they will shoot very well. I can't say enough good things about all of the people at Thunderbeast. I highly recommend them.