COMPLETE DIAGRAM


1 - Magazine
2 - Small Arms Sling
3 - Bolt Carrier Assembly
4 - Charging Handle Assembly
5 - Upper Receiver and Barrel Assembly
6 - Lower Receiver and Buttstock Assembly

BOLT CARRIER ASSEMBLY


1 - Firing Pin Retaining Pin
2 - Firing Pin
3 - Bolt Cam Pin
4 - Bolt Assembly
5 - Key and Bolt Carrier Assembly

BOLT ASSEMBLY


1 - Extractor Pin
2 - Extractor
3 - Extractor Spring Assembly
4 - Ejector Pin
5 - Ejector
6 - Ejector Helical Spring
7 - Bolt Rings
8 - Bolt

KEY/CARRIER ASSEMBLY


1 - Carrier And Key Screw
2 - Bolt Carrier Key
3 - Bolt Carrier

Courtesy of AR15.com.