Editing Action (firearms) (section)

===Eccentric screw action===
The '''eccentric screw''' action first seen on the [[M1867 Werndl–Holub]] and later on the [[Magnum Research]] Lone Eagle pistol, the breech closure is a rotating drum with the same axis, but offset from the bore. When locked, a firing pin aligns with the [[Primer (firearms)|primer]], the breech is otherwise solid.  When rotated open, a slot in the drum is exposed for extraction and feeding of a new round. Though first used on the Werndl-Holub, this action is commonly known as a cannon breech due to its association with the French 75mm Model of 1897 cannon.  The French M1897 was, itself, based on William Hubbell's {{US Patent|149478}}.