Lund conversion
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The Lund conversion is a modification allowing the Norwegian kammerlader rifles to fire rim fire ammunition. It was the preferred modification of the Royal Norwegian Navy.
In order to make the modification the chamber - which on the kammerlader is a separate piece tilted up and backwards - was replaced with a breechblock, and an extractor was mounted on the left side of the receiver. A chamber fitting the 12.17 x 44 mm rim fire cartridge was milled out of the rear part of the barrel. The right side of the receiver was lowered 6 mm (0.25 inch) and the bottom plate exchanged from a brass plate to a steel plate with a track for the extractor. The firing pin was curved to allow the hammer to strike it. A composite photo showing the Lund conversion can be seen here.