The Aero Precision AR15 Complete Lower Receiver with Magpul SL-K Carbine Stock is the perfect upgrade for your AR build. This complete lower features an AR15 Gen 2 Lower and is upgraded to include an Magpul SL-K Carbine Stock. A drop-in replacement buttstock for AR15/M4 mil-spec carbine buffer tubes, the SL-K(TM) is designed for compact PDW style weapons or users desiring a small and light stock.INCLUDES: AR15 Gen 2 Lower Receiver Magpul MOE Grip Magpul SL-K Stock Lower Parts Kit Carbine Receiver Extension AR15 Carbine Buffer and Spring These parts are installed