All Springfield's start their life at IMBEL in Brazil. The rest depends on the line and the serial number......
GI - 100% made in Brazil. They come in ready to ship. GI pistols have a WW serial number.
Mil Spec - All use Brazilian forgings. Some are complete when imported, some need finish machining and assembly. Guns under 80% complete when imported will have a serial number that starts with "NM". Guns more than 80% complete will have a serial number that starts with "N" alone.
Loaded - Same as above.
TRP - Brazilian forgings. Final machining, assembling, and fitting done in America. They should always have an NM serial number.
Operators - See TRP specifications.
Professional Models - Start from a blank Brazilian forging (a solid block of steel forged in the shape of a frame). They use more American parts, and every last bit if machining, fitting, and assembling is done in Springfield's custom shop. All Pro's have a GRG serial number.
Lightweight pistols have a different serial number regardless of where they're made. The only way to tell on them is by looking for a "Brazil" stamp on the dust cover or under the grips. The only Lightweights that are technically "NM" guns are the Operators.
From what I have seen with my own eyes, the NM guns finished by Springfield do have a better fit and finish to them than the Brazilian guns.