Barrel-Receiver Rear.Sight Assembly Front. Sight
Bolt Stop Pin
Internal Lock Keyway
Magazine Release Button
Mainspring Housing Latch
Internal Lock Keyway
The RUGER® COMPETITION MODEL MARK III has a slab-sided, heavyweight barrel with target grips and a scope base supplied with optical sight mounting rings.
The RUGER® 22/45 MARK III has a grip frame assembly made of molded synthetic polymer, with a grip shape and angle generally similar to "1911"-style .45 caliber pistols.
All RUGER® MARK III pistols have the same basic operating mechanism and include the following features with which the gun user should be thoroughly familiar:
Bolt Stop: When the last shot has been fired and the magazine is empty, the bolt stop automatically holds the bolt open. When there is an empty magazine in the pistol and the bolt is retracted manually, the bolt stop will automatically hold the bolt open. If a loaded magazine is inserted in the pistol when the bolt is closed and the bolt is then retracted fully, the bolt stop will not automatically hold open the bolt. The user can actuate the bolt stop mechanism to hold the bolt open at any time by retracting the bolt and pushing up the bolt stop.
The bolt stop can be released when an empty magazine is in the pistol by drawing back slightly on the bolt and depressing the bolt stop thumbpiece. When the bolt is released, it will move forward under pressure from the recoil spring.
The bolt stop is spring-loaded or detented in position. Therefore, when there is a loaded magazine in place and the pistol is jarred, the bolt may fly forward and chamber a cartridge. For this reason and as an essential safety practice, the safety of the pistol should always be in the "on" (S) position except when the user is firing the gun at a selected target.
Magazines: The 10-shot magazine (Part M10MKIII) for the RUGER® MARK III pistol is different from all other Ruger rimfire pistols. In addition to the familiar removable plastic bottom decorated with a silver "eagle," the M10MKIII magazine has a trigger interlock window and protrusion. (See "Magazine Nomenclature," p. 25.) The M10MKIII is the only magazine that should be used in RUGER® MARK III pistols because it is designed to correctly function the bolt stop and magazine disconnect.
The RUGER® 22/45 MARK III pistol uses a different 10-shot magazine (Part AP10MKIII) which is identified by its removable elongated plastic bottom. The AP10MKIII magazine is distinguishable from earlier 22/45 magazines by the presence of the trigger interlock window and protrusion. (See "Magazine Nomenclature," p. 25.) Note that the AP10MKIII is not interchangeable with the M10MKIII magazine described above. (See "Magazine Nomenclature," p. 25.) The AP10MKIII is the only magazine that should be used in the RUGER® 22/45 MARK III pistols because it is designed to correctly function the bolt stop and magazine disconnect.
Safety: The safety locks the sear when the safety is "on." Because the safety cannot be moved to its "on" (S) position unless the hammer is cocked, the safety therefore serves as a cocking indicator. The bolt can be manually retracted and released when the safety is "on" (S). This feature allows the pistol to be loaded or unloaded when the safety is "on" (S). As shown below and elsewhere in this Manual, the safety should be "on" (the "S" fully showing) at all times except when the gun user is deliberately positioned to fire at a selected target.
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