I do not think the Model 28 ever received any of the lock work durability upgrades as it was dropped from production in 1986 and I think the 29-3E began in 1987. The upgrades were applied to all N-frames, not just the Model 29/629, even though N-frames in calibers other than 44 Magnum seldom had durability issues.One more question. Where these changes also done to the Model 57 (41mag) and Model 27 and Model 28?