At first look the SN Book can be faulted as wrong, but as previous posters have pointed out, many guns were returned for significant alterations (shortened barrels, opened chokes, "trap forends", etc. A letter is the first "line of defense"'; after that a close examination of the gun in hand will tell you a lot if you know what to look for. Keep in mind that then, as now, someone's "dream gun" may have turned out as a little less that they had envisioned; in that case, many were returned for a "retrofit" to more closely adhere to the original "perfect gun" vision or fantasy.
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