Also, I found this in the Q&A section.
Q: Won’t visitors and wildlife be endangered by allowing concealed firearms in parks and refuges?
A: No. The final rule continues to maintain existing regulatory provisions that prohibit poaching, unauthorized target shooting, and other illegal use of firearms. Additionally, individuals authorized to carry firearms in a park or refuge will continue to be subject to all other applicable state and federal laws. We have no reason to believe that law-abiding citizens who carry concealed firearms will disregard these prohibitions and use their firearms for illegal purposes. Moreover, the final rule does not affect existing rules limiting the possession of loaded rifles or shotguns.