I have one of your 20" A2 models and it is a very fine shooter. However today I was shooting with my father and I noticed that my groups were significantly larger than usual. I blamed myself for poor marksmanship but when I came home to so my usual cleaning I found that the front sight base has come loose and can be wiggled back and forth (side to side) a noticeable amount. The delta ring is also very loose. I am going to send it in for repair as it is still under warranty but I was wondering if I should send the whole rifle, just the upper with no bolt and carrier and charging handle, or the complete upper assembly. Please tell me how you would prefer me to send it back.