The Aero Precision M4E1 Complete Lower Receiver with Magpul SL-S Carbine Stock is the perfect upgrade for your AR build. This complete lower features an M4E1 Gen 2 Lower and is upgraded to include an Magpul SL-S Carbine Stock. The storage-capable version of the flagship Magpul MOE SL™ carbine stock, the MOE SL-S (Storage) Stock is a direct replacement buttstock for AR15/M4 carbines.
