Starr Percussion Carbine, .54 cal. breech loading carbine.   Serial #21979, mfg. Yonkers, NY.  Very good condition. A very popular Civil War carbine that had lots of slam. 21” round barrel has excellent bore, little remaining finish with crisp markings, correct sights.  Correct brass barrel band and butt plate.  Receiver and lock plate have little remaining finish with crisp address and patent markings.  Saddle ring present.  Stock and forearm have numerous light nicks.  Action and lock work excellent.  An excellent example of a rare Civil War Calvary carbine!   Antique, can ship to your door.