The Sprinco USA Spring Kit (Sprinco part no. 25049) bundles a standard-rate buffer spring with a 4-coil bolt extractor spring, covering two of the parts most likely to fatigue on a running AR. The buffer spring drives the bolt carrier group back into battery, while the 4-coil extractor spring adds tension behind the extractor claw for firmer case-rim contact.

Key Specifications

• standard-rate buffer spring returns the bolt carrier group to battery after each cycle.
• 4-coil bolt extractor spring adds tension behind the extractor claw for firmer case-rim contact.
• sold as a two-part kit addressing both springs in a single purchase.

Frequently Asked Questions

What does this kit include? A standard-rate buffer spring plus a 4-coil bolt extractor spring.

What does the extractor spring do? It supplies tension behind the extractor claw so it grips the case rim firmly during extraction.

Buy the Sprinco Buffer & 4-Coil Extractor Spring Kit

Refresh buffer return and extraction tension on an AR-15 in a single order. Browse more of our rifle parts selection and order from our Lubbock, Texas gun shop.