This model follows all the general characteristics of the original military pistol in avoiding the use of pins and screws to retain working parts. The working elements are grouped in self-contained assemblies which operate largely through interlocking and through cam surfaces. All the mechanism is inserted from the rear into the receiver forging which consists of the grip section, the side plates, triggerguard and magazine housing, and supporting surfaces for the barrel extension.
A new type of universal safety lock is provided which permits the safety to be applied when the hammer is up or down. When the safety is applied with the hammer up, the hammer may be lowered without danger since it cannot hit the firing pin. 4
Except for such differences in mechanism as are necessary to provide an automatic sear to enable full automatic fire, and the arrangement for detachable magazine insertion, the construction and design, while differing in weights of parts from the earlier semi-automatic military pistol, is identical with that earlier form.
On the left side of the receiver to the rear of the trigger is an oval plate. A spring button with a knurled head forms the center of this plate. When forward, the plate points to the letter "N" indicating "Normal"—that is, standard semi-automatic fire in which one pull of the trigger fires a cartridge, ejects the empty and reloads ready for the next trigger pull.
When the plate is pushed to the rear it points to "R", indicating "Rapid"—that is, automatic fire as long as the trigger is held back.
This plate bears an integral pin passing across the inside of the receiver below the lockwork which has a bearing in the receiver.
Two cams are milled into this transverse plate pin, a large one near the center which engages with a spring-loaded lever which is pivoted to the trigger; and a smaller one on the right which is rounded to fit into a fork in an automatic sear disconnecting unit on the bottom of the receiver near the right hand sidewalL
Unlike the trigger in the standard type, this full automatic model trigger does not have a nose. A short spring lever bearing against the flat center cam on the transverse pin, is pinned directly to the trigger and is held against the cam by its spring. Since this lever is pivoted to the trigger below the trigger pivot line in the receiver, it provides long leverage.
While the loading, firing, locking and unlocking, extraction and ejection systems are about the same in both weapons, the action of the semi- and full automatic control requires attention.
When the sliding plate on the left side of the receiver is pushed forward to "N", its pin inside the receiver brings the flat surface of its center cam to the trigger lever. Thus as the trigger is pulled it raises the sear lever and then slips forward out of it. This permits the sear to reengage in its bent in the tumbler as the hammer is driven back by the recoiling action after falling and firing the cartridge in the chamber. The action is substantially that of the standard Mauser Military Model pistol at this time.
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