Hard to say. The most prevalent rifles of the civil war were the Springfield 1855 and 1861 but I don’t think that’s what you have. Better and more pictures would be helpful. If I had to guess, and that is all this is, it’s a Lorenz.
So, likely a Springfield pattern musket. Without seeing the receiver it’s tough.
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@Myfriendis410 when you say receiver you mean hammer?
@Poochie332 hey I’m just tagging you in dude in case you want to follow this
Reach out to Hickok45 on FB or IG with photos. If anyone I can think of that would know, it would be him.
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What does the inside bore of barrel measure? It can only be so old, it’s a percussion gun, not a flintlock….
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@Growdoc what do you mean by that? You mean there’s another barrel inside the barrel I measured for better precision?
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Cap and lock not flint and lock 
Just one looooong barrel 
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@StonedCold13 still over my head LOL all right so what do I need to look at to try to find info about it?
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Get a close up shot of the “hammer” area.
Right hand side of the “receiver”
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No, the hole in the barrel, the bore size. Percussion guns came around 1826 on private builder guns.
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Also a nice clear shot of the butt plate
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Flintlocks have a small pan and use a piece of flint to ignite the powder in the pan, which ignites the charge in the chamber. Percussion rifles (an improvement ofver flintlock) uses a cap which the hammer strikes sending a hot flame into the chamber igniting the charge.
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@StonedCold13 I don’t know if I like the way that sounds LOL
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At least I didn’t say Hole 
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@T-ray nice explanationnice explanation
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A close picture of the top of the chamber where the hammer is located might be helpful. Can you note any markings around the chamber?
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@StonedCold13 all right cool I guess that makes it a little better
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Butt plate, where ya put your shoulder
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