Even ignoring the fact this is vs firearms, this is a hell-fucking-no. Any time you do this, you create exclusive-jurisdiction for power-tripping wanna-be cops, and quite problematically, there's not many of them.giving them the ability to carry weapons, conduct investigations, and make arrests
This is the same as giving a lone mall-cop exclusive jurisdiction to arrest anyone in his mall, "investigate them" - resulting in tons of criminal charges, and oh yeah, give them a gun. And oh yeah, local law enforcement can't intervene in Mall cop's jurisdiction.
The state CAN work with local law enforcement. But they don't want pesky Sheriffs getting in the way, they want Team 'Rado Space force to roll in there with their purple haired trans unit driving five bearcats.