How much is a kings improvement March 29 1866 model 1873?

The value of a King's Improvement March 29, 1866 Model 1873 rifle can vary significantly based on its condition, rarity, and provenance. Generally, prices for these rifles can range from a few thousand dollars to over ten thousand for well-preserved examples. Factors such as original parts, historical significance, and market demand will also influence the price. For an accurate appraisal, it's best to consult a firearms expert or auction house specializing in antique weapons.