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In the 1990s-2000s there were LOTS of variations on the 3" 629
A 3" example of the 5th engineering revision of the Model 629 is not enough information to tell us what firearm you have
If you have the original box, there is a 6 digit product code on the label. That is what defines the factory configuration
Lacking a product code, posting some pictures would go a long way to determining what you have
Both of these 3" 629s are -5s
Both revolvers are wearing the correct factory supplied grips, but neither is Mag-Na-Ported