S&W issued a directive in May 1975 (not sure how long it took to implement the change) to increase the length of all barrels from 4 inches to 4 1/4 inches. This was done because of a concern that firearms with a barrel length of less than 4 inches would become illegal. The actual length of most barrels is 4 1/8 inches. This probably explains the difference between your 629 and your 29-2.
Bill
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