Our M5 (.308) lower parts kit helps you to build a custom .308 AR from the ground up. Mil- spec dimensions and coating ensure the highest quality and correct component interface. This lower parts kit does not include the fire control group or pistol grip. Specifications for Aero Precision M5 .308 Enhanced Lower Parts Kit w/No FCG or Pistol Grip: Manufacturer: Aero Precision Color: Anodized Black Caliber: .308 Winchester Gun Make: Aero Precision Gun Model: M5 Gun Type: Rifle Trigger Pin Size: Mil-Spec Included Accessories: Standard Condition: New Country of Origin: USA Features of Aero Precision M5 .308 Enhanced Lower Parts Kit w/No FCG or Pistol Grip: Aero Precision M5 (.308) Complete Lower Parts Kit; Our custom takedown and pivot pins are made to work with our M5 lower; They will work with DPMS-pattern lowers as well but will stick out further Package Contents: Aero Precision M5 .308 Enhanced Lower Parts Kit w/No FCG or Pistol Grip Takedown/pivot Spring Takedown/pivot detent M5 .308 Takedown pin M5 .308 Pivot pin M5 .308 Bolt Catch Bolt Catch Spring Bolt Catch Buffer Bolt Catch Roll pin (The threaded bolt catch roll pin not included, can be purchased separately) Safety Selector Safety Selector Spring Safety Selector Detent Buffer Retainer Buffer Retainer Spring Magazine Catch Body Magazine Catch Spring Extended Magazine Catch Button