That depends on which "Enfield" gun it is. The Enfield name applies to several rifles from blackpowder muskets to multiple variations of bolt actions made in several countries as well as a revolver. Values differ based on type of gun and condition.
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Condition is everything. Rule of thumb for an 1858 .577 calibre 3 band Enfield anywhere from $1500 to 10,000 depending on condition and provenance. Be keen to watch for fakes.