Antique Remington Single Barrel Muzzle-Loading Percussion 20 GA Shotgun

Serial #NSN, 20 Gauge black powder percussion, 30 inch barrel with a very fine dark bore.  This is a single barrel, center hammer percussion shotgun manufactured by Remington from 1866 into the 1870's with an unknown quantity.  In good antique condition the metal surfaces are plum-brown with old nicks and contusions.  The stock and forearm are solid and what appears to be an original brass jig tipped wood ramrod that is broken on the bottom section that is mostly concealed when stored in the gun.  The action cocks but does not consistently hold.  Any markings are obscured.  Antique