At the time this drilling was made the “Ammo & Arms Factories in Soemmerda, vormals = formerly von Dreyse” were a subsidiary of Heinrich Ehrhardt’s Rheinmetall companies. The drilling was made to the Robert Schrader, Goettingen, 1898 DRPatent Nr. 100914. All the Schrader patent guns were made at the Soemmerda factory. This is another example of the so-called “safety guns” that could be carried fully loaded and uncocked, but could be cocked and set on “Fire” with a single movement. I function Schrader’s locks were based on the same idea as F. Beesley’s famous springcocking sidelocks, found on most Purdeys: A V mainspring engages the hammer with both limbs. The stronger limb pushes the hammer back to the full cock position, while the weaker one tries to push it forward to fire it. As long as both limbs are engaged, the gun cannot fire until a cam lifts the stronger limb out of engagement with the hammer. On the Purdey sidelocks this cam is operated by closing the barrels, making the guns self-opening. Schrader operated such a cam manually by the protruding “third trigger”. This trigger-shaped lever has three functions. Pushed forward it serves as the underlever, opening the action. In the middle position, as shown in the photos, the gun is safe as both mainspring limbs are engaged with the hammers. Pulled back against the grip it operates the cams that disengage the stronger limbs from contact with the hammers. As the cams go slightly beyond dead centre, the lever remains in the “Fire” up position until pushed down, snapping to the “Safe” middle position again. As you have to push the lever down/ forward all the way to open and reload the gun, the mainsprings bring the hammers back to their full cock positions automatically.