If you are transporting firearms, you must notify the ranger or gate attendant on your arrival, and your firearm must be rendered inoperable before you enter the park. Individuals in possession of an operable firearm in a national park are subject to arrest.
Firearms are NOT permitted anywhere in the park’s backcountry. Firearms brought through Big Bend National Park must be unloaded, broken down (temporarily inoperable), cased, and stored out of sight and reach, with ammunition separated from weapons while in the park (36 C.F.R. 2.4(a)(3)).