The NRA actually has campaigned to prevent private organizations from being able to prohibit firearms on their property, vis a vi lobbying for concealed carry l

The NRA actually has campaigned to prevent private organizations from being able to prohibit firearms on their property, vis a vi lobbying for concealed carry laws that force businesses to allow gun owners to carry weapons on the business' property. Only a minority of concealed carry states allow business owners to "opt out" of the law and restrict weapons on their property.