If you had an ldc on that .22 would it now be considered a firearm with a silencer that falls under NFA laws?
I realize this is an old, old thread, but I wanted to respond to this so any future searches will have this information.
NFA is federal. No city, county, or state law will affect it. The state considering an air rifle as a firearm is not going to trigger a federal violation. The feds still consider an air rifle as a non-firearm. That being said, if the STATE has laws on the books about "silencers," as they refer to them, you may be in trouble there.