Aero Precision AR15 ENHANCED LOWER PARTS KIT SKU: APRH100301COur lower parts kit helps you to build a custom AR15 from the ground up. Mil spec dimensions and coating ensure the highest quality and correct component interface. Our upgraded Enhanced Lower Parts Kit features a Magpul MOE Grip and Aero Precision Billet Trigger Guard. INCLUDES: Takedown pivot Spring Takedown pivot detent Trigger hammer pin Takedown pin Pivot pin Bolt Catch Bolt Catch Spring Bolt Catch buffer Bolt catch roll pin Safety Selector