Drawing from Patent 49,959 showing Erskine S. Allin's design for a breech loading conversion to civil war rifled muskets.
Erskine S. Allin (originally uploaded by <a href="https://en.wikipedia.org/wiki/User:Engineer_comp_geek" class="extiw" title="w:User:Engineer comp geek">User:Engineer comp geek</a>)
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