Mississippi has a "Firearms Permit". You can get the endorsement by completing the Dept. of Public Safety class which is eight hours of instruction and range time. It is basically the Tennessee Handgun Permit class. The DPS requires that you take the class from someone who is on their approved list of instructors.
I have some links that I think will be useful to you but I can't seem to post them here.
I hope this helps.
Bob
Is that different from a carry permit?