Originally Posted by
LAX2MSP
All FOs at 121 operators log SIC. Only the captain can log PIC. That is determined by whose name is listed as PIC on the flight release. PF vs. PM and "sole manipulator of flight controls" does not matter. FOs are fully type rated though.
Legally speaking, you can put whatever you want in your logbook. All that matters is what the place you are applying to counts toward their minimums.