This is the Aero Precision AR-15 lower parts kit.

The lower parts kit helps you to build a custom AR-15 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, pistol grip or trigger guard.

This kit includes:

• Takedown/pivot Spring
• Takedown/pivot detent
• Takedown pin
• Pivot pin
• Bolt Catch
• Bolt Catch Spring
• Bolt Catch buffer
• Bolt catch roll pin
• Safety Selector
• Safety Selector spring
• Safety Selector detent
• 4-40 Set Screw (for threaded takedown pin detent hole)
• Buffer retainer
• Buffer retainer spring
• Magazine catch body
• Magazine catch spring
• Magazine catch button