The barrels are the correct length, according to the ID & Ser book on both numbers you have listed. Extra length of Underlifter gun barrels is not uncommon... usually 1/8" - 1/4" longer than listed in the books. Where did that number on the barrels come from... the side of the lug or the barrel flats? The number on the barrel flats is almost always the order number for an Underlifter.
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