Two times now, the MHP has asked for, received and shared with the federal government, exactly who in Missouri has obtained a Concealed Carry Weapons Permit.
The full story is here.
While not a gun registry per se, it is a registry of who has applied for and received a permit to conceal a weapon on their person legally. Missouri law does not allow this. It is up to MO AG Chris Koster to investigate and prosecute this.
Edit: Please forgive me, law enforcement is not sworn to protect people, they are sworn to uphold and enforce the law.