36 CFR §327.13

1. (a)The possession of loaded firearms, ammunition, loaded projectile firing devices, bows and arrows, crossbows, or other weapons is prohibited unless:
   1. (1)In the possession of a Federal, state or local law enforcement officer;
   2. (2)Being used for hunting or fishing as permitted under § 327.8, with devices being unloaded when transported to, from or between hunting and fishing sites;
   3. (3)Being used at authorized shooting ranges; or
   4. (4)Written permission has been received from the District Commander.
2. (b)Possession of explosives or explosive devices of any kind, including fireworks or other pyrotechnics, is prohibited unless written permission has been received from the District Commander.