My FIL brought over this rifle a friend of his had laying around. It only has the marking on the stock as seen in the picture although we didn't take it apart. Has a little lever on the right side of the forearm that you press and the fore end slides off. Really big percussion cap on it. It is rifled. Missing the ramrod and has a bayonet lug on the right side of the muzzle. We have no idea where it came from and somehow neither does his friend, just had been in the basement for years. Interested in what you guys can tell me. Thanks!