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The STS (Short Throw Safety) AR-15 Lower Receiver features the same specifications as Aero Precision’s standard lower receiver, but is designed to accept Short Throw Safeties, such as the Battle Arms Ambidextrous-Short Throw 45 (100-009-866).  Clearly stamped safe/fire switch position indicators, with the fire location at 45/60/90 degrees, ensure that you can easily identify the service state of the rifle.   Stripped, small pin, semi-auto lower receiver is precision machined from a durable, 7075 T6 aluminum forging. Stamped “Cal Multi,” this versatile mil-spec receiver can be the foundation for rifle builds on 5.56/.223, 6.5mm, 6.8mm, 300 AAC Blackout, 9mm Luger, or other chamberings that fit the standard AR-15 receiver. Holes, inletting and pin locations have been cut to final dimensions and accept standard AR-15 magazines and components.

Note: Selector markings will work with 45, 60 or 90 degree safety selectors.  This lower receiver will work with Short Throw Safeties or standard selectors.


AR-15, Issue:11, Page:007
Big Book Catalog, Issue:73, Page:008

SPECS: 7075 T6 aluminum, hardcoat anodized, matte black. Small pin, .154” (3.9mm) hammer/pin holes. .250” (6.3mm) pivot/takedown pin holes. FFL required for purchase.

AERO PRECISION - AR-15 SHORT THROW SAFETY STRIPPED LOWER RECEIVER

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