What is the value of a stone mountain arms silver eagle 50 cal black powder rifle?

The value of a Stone Mountain Arms Silver Eagle .50 cal black powder rifle can vary based on its condition, provenance, and the current market demand. Generally, these rifles can range from around $300 to $800. Collectors may pay more for well-preserved or rare models. For an accurate appraisal, it's best to consult a firearms expert or check recent sales of similar models.