4th of July sales were calling my name, I ordered a Precision Armament M4 - 72 Muzzle Brake with a set of their indexing washers that were recommended, got a good price and free shipping, just couldn't pass it up. I'm hoping it won't be much of a project to install. I was wondering if anyone has any experience with this brake. I saw on YOUTUBE it wins the 10 Brake test as far as recoil reduction was concerned. Got the 30 caliber for my 6.8 as recommended and hope since I have an 18" barrel it won't blow my eardrums out.