The Ruger Standard Automatic and Mark I Automatic are .22 caliber rimfire, 9-shot, magazine fed, semi-automatic recoil ('blowback') operated pistols. Both models have the same basic operating mechanism. WARNING: These pistols will fire whether or not there is a magazine in the gun if there is a cartridge in the chamber. Removing the magazine does not unload the pistol. To unload the pistol, FIRST REMOVE THE MAGAZINE, THEN PULL BOLT FULLY TO THE REAR AND EJECT THE CARTRIDGE. DONT ASSUME THAT THE CHAMBER IS
EMPTY, VISUALLY INSPECT IT EVERY TIME YOU HANDLE THE PISTOL.
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