The back of the barrel has a boss on it around where the barrel screws into the frame. Above and below the round boss is cut for clearance, usually a thousandth or 2. Only the round boss is supposed to touch the frame. Sometimes the clearance part gets cut too much, resulting in an obvious gap. This is a variable in the manufacturing process. Yes, a big gap looks bad. You have to get a gun with a close gap in exactly the right position to see it, but they all have some amount.
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