Never rely upon any safety mechanism or mechanical device to justify unsafe or careless handling of a firearm. When securing your pistol or to prevent unauthorized access, you should completely unload the pistol and store it in a gun safe or use the key-operated external locking device supplied with your pistol. (See Page 5.) However, for added security, and to comply with certain state and local laws, your RUGER® MARK III pistol is also equipped with an internal lock. When actuated, this internal lock will secure the pistol's manual safety in the "on" or "safe" position.
Before activating the internal lock on your pistol, first visually inspect the chamber and magazine to verify that they are empty and do not contain any cartridges.
To activate the internal lock, place the manual safety in the "on" or "safe" position. (Note that the pistol must be cocked to engage the safety.) Next, place the internal lock key (supplied with your pistol) into the internal lock keyway. (See "Nomenclature," p. 8.) Rotate the key fully clockwise (about 1 3/4 of a rotation from the fully unlocked position) until it stops. (See Figure 3.) Remove the key and verify that the internal lock engaged by attempting to move the safety to the "off" or "fire" position. If the internal lock is engaged, you will not be able to move the safety to the "off" or "fire" position.
To deactivate the internal lock, place the internal lock key into the internal lock keyway (see "Nomenclature," p. 8) and rotate the key counter-clockwise (about 1 3/4 turns from the fully locked position) until it stops. (See Figure 3.)
Be sure to store the internal lock key in a secure location, away from children and careless adults. Do not store your firearm with the key in the internal lock keyway. Never lock a loaded gun - always unload the gun before locking.
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