There are quite a large block of serial numbers of Mass. Arms Smith Carbines and Colt 1860 Army Revolvers listed to have been with the 1st Alabama Cavalry USV that have been pulled out of the Archival Records. The catch is that they are in private hands and difficult to access. And then by single number only because those who hold the numbers will not disclose the numbers they have documented. Yes, they also charge a fee to look up a number for you, and much more if your number is shown in their records and documented for you. If your Smith or Colt happens to be one of those captured by the 2nd Alabama Cavalry CSA at Vincent's Cross Roads, then the sky is the limit!
J.