Aero Precision M5 Lower Parts Kit - For AR10 - Magpul MOE Grip in Black - 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