The U.S. Harpers Ferry Model 1803 was the first true military rifle issued by the U.S. government. Prior rifles were basically civilian American long rifles purchased from gunmakers, but this model was designed and manufactured at the Harper's Ferry Arsenal. It is also distinct from the rifles that followed thanks to its half-stock configuration and under-rib on the barrel. Altogether they are unique and historically significant U.S. martial arms. Features include seven-groove rifling, low profile brass blade front and notch rear sights, a brass "wedding band" at the transition point, sunken "US" and "eagle head/P" proofs marked on the upper left barrel flat at the breech, an "eagle" containing a "US" marked shield at the center of the lock, "HARPERS/FERRY/1818" on the tail of the lock, brass furniture, and a replacement iron ramrod with flared brass tip. Partially legible period markings "CONd G(illegible)A(illegible)" marked on the upper left flat of the barrel. "PJ JR" marked in the stock behind the barrel tang, and "JR" on the right of the buttstock above the patchbox. A few period added brass plates are located on either side at the top of the buttplate and one on the left of the buttstock with punch dotted initials "JRS". A small unmarked period silver plate is located on top of the wrist. The bore has been enlarged, with faintly visible rifling, likely used for hunting purposes after the rifle was sold off as surplus and intended for use with shot.

Good as reconverted to flintlock configuration, with period applied brown finish and scattered mild pitting and some filing marks visible at the breech underneath the finish. The brass exhibits a bright golden patina. The stock is very good as lightly sanded and re-oiled, with scattered scratches and dents, a few small filled in repairs, and solid figure. The full cock is non-functional, mechanically needs work.