The Gibbs carbine is one of the scarcest and best designed carbines used by Union forces. Only 1,052 Gibbs carbines were manufactured by William F. Brooks of New York City at the Phoenix Armory and delivered to the U.S. government in 1863 due to the factory being burned down during the New York Draft Riots in that same year. Around 500 of these were issued to the 10th Missouri Cavalry and smaller quantities were issued to the 13th and 16th New York Cavalry. "Wm F. BROOKS/MANFr NEW YORK" marked on the lock ahead of the hammer with the patent date marked on top of the breech.