I put a slot on my FAC renewal for a .22 air-rifle.

If I up the power on my air-rifle myself can I add it to my own FAC?
Or do I have to get a RFD to mod my cert?

If the air-rifle is on the cert does it HAVE to be > 12ft/lbs. What I am getting as is if I down the power myself do I have to take it off the FAC or can it live there even although the rifle is <12 ft/lbs.

I have chronos etc that would show the rifle to be reasonably below or reasonably above the limit.

jon