Aero Precision M5 Lower Parts Kit, For AR15, Magpul MOE Grip in Flat Dark Earth, M5 (.308) Takedown Pin, M5 (.308) Pivot Pin, Takedown/Pivot Detent, Takedown/Pivot Spring, M5 (.308) Bolt Catch, Bolt Catch Buffer, Bolt Catch Roll Pin, Bolt Catch Spring, Extended Magazine Catch Button, Magazine Catch Body, Magazine Catch Spring, Buffer Retainer, Buffer Retainer Spring, Safety Selector, Safety Selector Spring, Safety Selector Detent, 4-40 Set Screw, Trigger, Hammer, Trigger Spring, Trigger/Hammer Pins, Hammer Spring, Disconnector, and Disconnector Spring APRH100973 This M5 Lower Parts Kit includes the components needed to assemble an Aero Precision M5 Lower Receiver. It features a Magpul MOE Grip. See below for a full list of included components. M5 Specific Parts include: M5 Takedown Pin" M5 Pivot Pin" M5 Bolt Catch and Extended Magazine Catch Button.