Made in the USA, San Tan Tactical's Lite Lower Receiver has the same great aesthetics as San Tan's standard STT-15 Receiver but incorporates a significant weight reduction. It features a 1.38" integrally machined magazine well flare, safety selector markings, set screw trigger creep adjustment and upper take down tension adjustment, captured rear take down pin detent and spring, oversized winter trigger guard, and a no roll pin design. It assembles using the included threaded dowel screw. The STT-15 Lite Lower does not included STT Ultra Grip Kit. NOTE: Magazine Compatibility: 100 Round Beta Mag, 100 Round Surefire,60 Round Surefire, 30 Round Magpul P-MAG Any Generation, 20 Round Magpul P-MAG Any Generation, 10 Round Magpul P-MAG Any Generation, 30 Round Mil-Spec Mag, 20 Round Mil-Spec Mag. Component Compatibility: Works Will All Mil-Spec AR-15\M16 Components* Excluding proprietary ambidextrous controls.