An FTR is "factory through repair". It is a repair. Not an "upgrade". As in "upgrade in mark", which is what the /3 is. It is the upgrade to the hung trigger from the receiver, as your pictures show. An FTR is parts replacement/wood, but not a change of mark.
FTR's have (usually) the year stamped on it, change of marks don't always have the year.
But some do. Here is an example of this.
So the question here is, did the FTR happen after the /3 conversion, or part of the conversion process?Information
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