National Forests follow the state law for unincorporated areas. The exception being rules for discharge within a campground and Federal building non carry, restrooms with exterior doors excepted (I thinks).
I think you are confusing National
Parks (NPS) with National
Forests (USFS). There is a difference in these two entities - they are not the same.
NPS rules: Congress approved a new law allowing loaded firearms in national parks starting Feb. 22, 2010. That means people can openly carry legal handguns, rifles, shotguns and other firearms and also may carry concealed guns as allowed by state statute.
Guns cannot be carried into federal facilities (buildings) within national parks. Notice of this rule will be
clearly displayed outside all federal facilities.
http://www.nps.gov/grca/parkmgmt/upload/Firearms-in-IMRparks2-2010.pdf
USFS rules:
Both state and federal laws apply on National Forest System lands, so you also need to check on the state laws and county ordinances which may apply to the area you will be visiting. You also need to be in compliance with any general federal laws and regulations about weapons (Bureau of Alcohol, Tobacco, Firearms and Explosives (
ATF), etc). The National Rifle Association of America (
NRA) and many commercial publications provide this information.
The only regulations specific to use of weapons imposed by the Forest Service is that you cannot discharge a weapon within 150 yards of any structure/development or occupied area, within or into a cave, across or on a road or body of water, or in any manner that endangers a person. You also cannot use any tracer or incendiary ammunition. Forest Service regulations require that you also comply with all State laws regarding the use of firearms while hunting.
http://www.fs.fed.us/recreation/programs/trails/welcome.shtml
You will note that USFS does
not address the manner of carry; however, your state or local laws may.