1. Registered name
2. City and state where firearm is made
3. Model
4. Caliber
5. Serial number
In general, that means a Maker only has to add #1 & #2...as you’ll adopt the SN and Model (if applicable) from the original manufacturer, and caliber is usually already engraved as well. 1-4 have to be on the frame, receiver, barrel or pistol slide. 5 has to be on the frame or receiver.
The only time most people have to engrave the caliber is on an AR where the lower is marked “multi” and the barrel isn’t marked...which generally only happens if you’ve chopped down a longer barrel and lost the markings in the process.
#1 should match the F1
#2 doesn’t have to, although it usually does (your mailing address is on the F1, but if you drove over to a different city to convert it from a pistol to an SBR, then that location is actually what’s supposed to get engraved)