My nail gun will not fire a nail. Do I need to oil it or something?

Hello, W/D here.

Here's a couple of things to do or check:
1. Put a couple of drops of a light oil in the nailer with the trigger depressed, and the gun disconnected from the hose. Set it to the side for now, with the air inlet facing up.
2. Check the compressor outlet pressures. The gauge nearest the tank is the air pressure on the tank. The gauge closest to to the hose is the tool supply pressure. Between the gauges id the regulator, where you can increase or decrease the pressure to the tool.
3. Check your required air pressure for your nailer, and make sure that your regulator is supplying at least that much to operate the nailer.
4. Connect the nailer to the hose, Spray the underside of the nailer head (the slide assembly where the nails are driven) and try to drive several nails into scrap wood.
5. If the nailer operates properly, all's well. If it still fails to operate, place a few more drops into the air inlet (while holding the trigger down) and wait a few minutes, then try the gun again.
There are other things that can be done, but oiling the nailer should get you going. BTW, you should oil the nailer before each use, and when you put it away.
Best regards, --W/D--