Any markings?
I don't like the way the stock fits, edges look too sharp. Could be a replacement stock. Look how the trigger guard on my 1863 Pattern 1853 Snider-Enfield fits, looks like the inletting on your trigger guard is lacking. Also the lock plate has either been replaced, or wrong type of stock, or something due to the patching of the rear of the lockplate inletting. While all that doesn't mean it's fake versus real, they are redflags.
Clear pictures of any markings you find would help determine if real or reproduction.
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