I'm a new poster on these forums and figured somebody here HAS to know what the heck this lunker is! Huge bore - unusual side bayonet mount and it appears to be early military. I'll include a link to the photos of all the close - ups. All parts numbered 1873. There are some proof marks as shown. Thanks for any help you can offer. It will be great to finally figure out what this thing is.
Here is a link to photos:

http://home.ptd.net/~caric/bprifle.jpg
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