Daryl, there is not a speck of lift in the action plate, nor any gaps in any of the metal to metal fit.
There is a darkness of the coloring that could give that impression on the bottom side.
If you use your zoom on your computer, you can also get a good look at the metal to wood fit.
I do have a couple of other late 'A' and above grades that also have a case colored trigger plate. None of which are as nice.
If you look at the pictures of the recent A1S 16 that was talked about on another thread, it also has a case colored trigger plate.
I think that it was a late change on the A and above guns, but I could not tell you when that exactly happened.
As Tom knows, there are quite a few 'anomalies' when it comes to Syracuse features in relation to serial numbers.
I would guess somewhere around or above #30k.
This is not the gun that was for sale in Michigan, that gun should surely have a blued trigger plate.
But heck .... I could be wrong.
