Chris,
I do not own any of the newest 27 and 29 variants so lets just assume that the timing, lockup, and overall functionality of the new guns are equal to, or from what you are saying, superior.
Yes, with the new technologies such as CNC machining, there have been great advancements in manufacturing, no doubt about it. But, wouldn't you agree that these advancements are generally geared toward efficiency, cost effectiveness, and increased production?
You simply CAN NOT tell me, after looking at the gorgeous pre war revolver below, that is was not well made, and that the new models are superior; they are good guns but they don't hold a candle to the older guns assembled by hand. Just look at the sideplate fit on that gun.....HAND FITTED.

These guns were made for the long haul, heck look at the picture again, its not from the 1930's, that's a recent picture and that gun still looks darn good; what will the current production guns look like after 75years? I guess we'll find out!
In today's world, there is not a lot of time for manual processes like hand fitting, the machines spit out the (to spec) parts and everything is assembled and functions like it should.
Back then the manufacturing processes that were used did not allow for the degree of mass production that we see today and those manual processes is where a lot of the quality comes from.
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I totally agree with this but look at the side plate of my 25-15 It aint such a dog!