Ruger Security-Six .357 Magnum, 4" Blued, Early 150-Prefix Low-Back Frame, Adjustable Sights, Walnut Grips
This Ruger Security-Six is an early 150-prefix low-back frame variant from the Six-Series, chambered in .357 Magnum with a 4" barrel. It features a polished blued carbon-steel construction, adjustable sights, and checkered walnut grips with silver Ruger medallions. The revolver retains Ruger's transfer-bar safety system and a six-shot fluted cylinder, reflecting the robust, duty-ready design widely issued to U.S. law enforcement in the 1970s–1980s.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Good - Clean, well-maintained, minor wear marks.
Bore Rifling: Good Rifling - Intact, well-defined lands and grooves.
Specific Condition Notes: There are scattered scratches and blemishes on the finish. Minor carbon buildup is present on the cylinder face and around the forcing cone, consistent with typical firing.
What’s Included
- Ruger Security-Six .357 Magnum revolver
As a 150-prefix low-back frame example, this Security-Six represents the early grip-frame profile associated with initial production. Collectors and Ruger enthusiasts will recognize this configuration as a distinctive phase in the model's evolution within the Six-Series lineup.
The 4" barrel combines a partial underlug/ejector-rod shroud with longitudinal anti-glare serrations along the top. Sights consist of a ramped, cross-pinned front and an adjustable square-notch rear, offering a clear, practical sight picture.
Construction is all carbon steel with a polished blued finish, paired with a six-shot fluted swing-out cylinder and Ruger's push-button cylinder latch on the left side. The checkered walnut grip panels feature silver Ruger medallions, providing a classic and secure hold.
The double-action/single-action system uses a smooth-faced trigger and a spurred, checkered hammer. Ruger's transfer-bar safety allows safe carry with all six chambers loaded.
Noted for broad U.S. law enforcement use during the 1970s–1980s, the Security-Six established the foundation that later led to Ruger's GP100 series, making this early-variant example a meaningful piece of that lineage.