I have several 03's & A3's . There are vast differences in the in the "space" (gap) between the safety lug and upper reciever right side wall when the bolts are cammed down into the locked/cocked position. None of which actually contact the side wall (rear reciever bridge ?) but one is so close that I had to hold it up to a light to see the gap and at the other extreme another has a gap of approx . 1/16 of a inch.
Can any of you knowledgeable brothers comment on this condition and how this safety lug was orginally engineered ?