The Arms & Equipment in the Civil War Message Board

muzzle loader

I have a rifle that I would like to ID. I have no history on this gun. The barrel is 39" long and appears to have rifling. The ram rod fits in four brass sleeves under the barrel.I do not know the caliber but the bore measures about 3/4".The only markings are on the firing mechanism. A "K" appears twice, and the No."6074" once. If additional photos are needed let me know.
Thanks for any help on this.