The Barnekov Greene Prototype 1870 carbine represents a unique open-bolt, toggle-locked single-shot rifle design that competed in the 1872 US Army trials. Despite its innovative mechanism, the design suffered from accuracy issues due to the open-bolt operation and potential safety concerns, leading to its withdrawal. This rare prototype, patented by K.L. Barnekov, ultimately did not see adoption, remaining a historical curiosity.
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