Thank you for he info. This forum has a lot of knowledgeable people. I am not sure the A2 flashhider on the sport is so loud. The PSA has the A2 also. The DD has their own which is about the same as the PSA, but reduces or redirects the little recoil it has more straight back. Maybe I did something after putting the flashhider back on the sport. I had it so hot after running about 9 30 round mags through it that I shot it off the gun. I used another crush washer, but just wrench tightened it with channel locks. I probably should get a torque wrench set. I have put a couple hundred rounds through it since and no problems, just louder. This was soon after I bought it and before getting the other rifles.

