Krag Jorgensen Parkhurst Zalinski Indexing Arm

The Krag-Jorgensen was the main infantry rifle of the US from 1894 to 1903. After their experience in the Spanish American War, the United States sought a quicker shooting cartridge and attempted to stretch .30-40 to it's limits, however they ran up against the weakness of the US Krag's single locking lug system. A new rifle was in development, but two designers attempted to prolong the Krag's service life by adding features. Parkhurst developed a stripper clip as well as a guide that attaches to the rifle. An inventor by the name of Zalinski collaborated with Parkhurst on the second improvement, which was a system of indicators that could tell a shooter how many rounds were left in the rifle. The most noticeable was the indexing arm mounted above the magazine door that pivoted across depending on how many rounds were in the magazine.
The Parkhurst Zalinski index was only added to a handful of rifles and never saw any further development or adoption, not even a patent. In this video I replicate the indexing arm.