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Bolt Carrier Rebuild Kit
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boltcarrierrebuildkit
Bolt Carrier Rebuild Kit. 

Bolt Carrier Rebuild Kit.

Includes all of the parts needed to completely rebuild your bolt and carrier. includes extractor, extractor spring & pad, extractor pin, ejector, ejector pin, ejector spring, 3 bolt gas rings, carrier key, 2 carrier key screws, firing pin, firing pin retainer, and O ring.

Firing Pin
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firingpin
Firing Pin. 

AR-15 Firing Pin.

This is one of the best spare parts to have.

AR-15 Titanium Firing Pin
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firingpin
AR-15 Titanium Firing Pin. 
AR-15 Titanium Firing Pin.
AR-15 or M-16 Titanium Firing Pin.