Prior to secession, the State of Mississippi purchased as many as eight hundred 1st model Maynard carbines from the Massachusetts Arms Company, Chicopee Falls, Mass. The only reference I can locate for any Mississippi company equipped with these firearms was the "Noxubee Cavalry", later part of Miller's Mississippi Cavalry Battalion.

Does anyone know of others?

http://freepages.genealogy.rootsweb.ancestry.com/~rldupree/Hell%20Roaring%20Calvalry.htm

Reference --
Civil War Magazine (April 1986), "Maynard - Massachusetts-made Carbines become the favorite of Rebels"