Thanks, it's good to know that my sig line is working. 
The answer to your question isn't in the FAQ as far as I know, but here it is in 16 USC 480:
Here is an example from my photo album:

1) All of that land is in Tahoe National Forest.
2) My Grizzly is parked at the boundary of a state wildlife refuge and state laws and regulations regarding those apply if I drive across the boundary.
3) The boundaries of that wildlife refuge are defined in Placer County Code 9.20.010, and that code also states that it is a no-carry and no-discharge zone:
If I were to cross into that area and discharge my usually-disassembled-cased-and-locked survival rifle, I'd be violating both the county code and various state laws (including 12031 even before I discharged). All of that... out in the national forest.

The answer to your question isn't in the FAQ as far as I know, but here it is in 16 USC 480:
The jurisdiction, both civil and criminal, over persons within national forests shall not be affected or changed by reason of their existence, except so far as the punishment of offenses against the United States therein is concerned; the intent and meaning of this provision being that the State wherein any such national forest is situated shall not, by reason of the establishment thereof, lose its jurisdiction, nor the inhabitants thereof their rights and privileges as citizens, or be absolved from their duties as citizens of the State.

1) All of that land is in Tahoe National Forest.
2) My Grizzly is parked at the boundary of a state wildlife refuge and state laws and regulations regarding those apply if I drive across the boundary.
3) The boundaries of that wildlife refuge are defined in Placer County Code 9.20.010, and that code also states that it is a no-carry and no-discharge zone:
Prohibited. Except as hereinafter provided, it is unlawful for any person to carry or discharge any firearms, explosives, bows or arrows or other similar missile within the unincorporated areas of the county as set forth and described in subsection B of this section, or to discharge any of the aforesaid into such areas.
B. Applicable Area. This area to which subsection A of this section applies is described as follows: {very long and confusing description of the area's boundary in surveyor lingo}
B. Applicable Area. This area to which subsection A of this section applies is described as follows: {very long and confusing description of the area's boundary in surveyor lingo}

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