Grayrock Volunteer got it right on the brass Bar-on-Band.
Inventory numbers 2363 and 2367 are known, which are only a few numbers away from the "Kirkland" example, and out of the same crate. One is Id'ed into the 2nd SC. These rifles were most likely a Government purchase early in the war, and supplied by Grazebrook, an arms speculator, to the CS agent in London for export.
They were also issued Pattern 1853 type 3 Enfield rifle muskets