Havent put a new scope on yet, but this may be a little more info to go off of. I will be trying a new scope tomorrow....but, I had this scope on my VTR AR15 all last season for coyot hunting. Never had any problems returning scope back to zero. We had it dialed in and a dope chart on it set up for 500 yards. It was very accurate. Scope would always go back to zero. Again, this was on a little .223. I realize a muzzle break puts reverse forces on a scope, but I would think it could handle it. Another thing, at the range the other day, I spun the dial probably 20 or so clicks up. Fired a round and as expected, shot high at 100 yards. I didn't measure to see if it was accurate as far as being high, I only did this to see if the scope would return back to zero, which it did. It was right on. I will continue with a new scope tomorrow. If that doesn't work, I'm dropping the gun off to a local guy. Thanks again fella!