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The STS (Short Throw Safety) AR-15 Stripped Lower Receiver by Aero Precision is the perfect lower to start your build. Custom designed markings accept short-throw safety selectors while maintaining mil-spec dimensions and correct component interface. Selector markings will work with 45, 60 or 90 degree safety selectors. STS lowers are marked and milled to accept short-throw safety selectors, but will work with standard selectors as well! Includes: Stripped AR15 Lower Receiver, STS Features: Caliber Marked: MULTI Forged Mil-Spec 7075-T6 Aerospace Grade Aluminum Black Hardcoat Anodized to MIL-A-8625F, Type 3, Class 2 from Ground Zero Precision

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