Serial: (1) NSN ; (2) NSN Manufacturer: (1) MiddTN CONN 1836; (2) E. Remington & Sons Model: (1) US M1816 Conversion ; (2) No. 1 Rolling Block Caliber: (1) 69 Cal ; (2) 20ga (approx.) Barrel length: (1)Â 42 in.; (2) 26 in. OAL: (1) 57.75 in.; (2) 42.25 in. Condition: Poor-Fair; moderate wear & handling marks throughout including pressure dents, scratches, gouges & scuffs; oxidation throughout with sporadic pitting; (1) has heavy wear & oxidation with large chunks missing from stock & heavy pitting around lock; bores are both fair with sporadic pittingÂ