DoubleStar uses high quality American made parts to ensure performance in your AR15. Why Choose DoubleStar Parts instead of the Other Guys; DoubleStar uses only the best parts to make their lower parts. Lesser Parts use metal injected molded or improper steel to cut costs. The lesser part will wear at an extremely high rate and need replacing sooner. DoubleStar parts are made to last for the lifetime of the weapon.
The bolt carrier rebuild kit provides everything you need to rebuild your AR-15 bolt carrier..

Includes:
Extractor
Extractor Spring with Bumper Pad
Set of 3 Gas Rings
O Ring
Extractor Pin
Firing Pin
Firing Pin Retaining Pin
Gas Key
Two Gas Key Screws
Made in the USA