RUGER-57 PISTOLS WITH A SERIAL NUMBER OF 642-26275 AND ABOVE ARE NOT AFFECTED BY THIS SAFETY BULLETIN. Products Subject to This Safety Bulletin Potentially affected pistols include any Ruger-57 pistol with a serial number of 642-26274 or lower (including all Ruger-57 pistols with a “641” prefix). If your Ruger-57 pistol is within this range (641-00000 to 642-26274), you should follow the inspection procedure outlined below to determine whether your pistol requires a retrofit. Ruger-57 pistols with a serial number of 642-26275 and above are not affected by this Safety Bulletin.
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