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Upgrade Your AR-15’s Reliability with Sprinco’s 4-Coil Extractor Spring Kit
Extractor spring failures are a common cause of malfunctions in AR-15 platforms, especially under high-volume shooting. Sprinco’s 4-Coil Extractor Spring Upgrade Kit reinforces your bolt’s extraction system with a precision-engineered spring designed for consistent tension and longevity. This 3-pack ensures you have spares on hand for maintenance or multiple builds. Ships to all 50 states with no restrictions.
Key Specifications
- Material: Heat-treated chrome silicon steel
- Design: 4-coil configuration (vs. standard 3-coil)
- Compatibility: Fits mil-spec AR-15/M16 bolts
- Quantity: 3 springs per pack
- Finish: Corrosion-resistant coating
Why Upgrade Your Extractor Spring?
The extractor spring is critical for maintaining consistent cartridge grip during the ejection cycle. Factory springs often weaken over time, leading to failures to extract (FTEs) or erratic ejection patterns. Sprinco’s 4-coil design increases tension by approximately 20% over mil-spec springs, reducing the risk of malfunctions during rapid fire or adverse conditions.
Chrome silicon steel provides superior fatigue resistance compared to standard music wire springs. This material choice ensures the spring retains its tension through thousands of cycles, making it ideal for competitive shooters or those running suppressed setups where backpressure increases wear on bolt components.
The 3-pack configuration offers practical value. Extractor springs are small, easy to lose during maintenance, and degrade with use. Having spares in your range bag or workshop prevents downtime when servicing multiple rifles or assisting fellow shooters.
Unlike aftermarket extractor kits that require modifying your bolt, this drop-in spring maintains compatibility with existing components. No gunsmithing is needed—just remove the old spring and insert Sprinco’s upgrade during routine cleaning.
Compatibility Notes
Designed for mil-spec AR-15 and M16 bolts. Not compatible with:
- AR-10/LR-308 platforms
- Proprietary bolt designs (e.g., some piston-driven systems)
- Non-mil-spec extractor claws
Installation Overview
1. Remove the bolt carrier group (BCG) and disassemble the bolt.
2. Extract the factory spring and insert spacer (if present).
3. Press the new 4-coil spring into the extractor recess until fully seated.
4. Reassemble the bolt and test function by hand-cycling dummy rounds.
Note: Excessive resistance during reassembly may indicate improper spring orientation. Consult an armorer if unsure.
Frequently Asked Questions
Q: How often should I replace the extractor spring?
A: Inspect during routine BCG maintenance. Replace if extraction becomes inconsistent or every 5,000 rounds for preventive care.
Q: Will this work with enhanced extractors like the BCM or Lantac designs?
A: Yes, as long as the extractor follows mil-spec dimensions.
Q: Does the 4-coil spring increase wear on the extractor?
A: No—the design balances increased tension with controlled force distribution to avoid premature part fatigue.
Q: Can I use one spring for multiple calibers (e.g., 5.56 and .300 BLK)?
A: Yes, but .300 BLK may require more frequent inspection due to higher bolt thrust.
Q: My rifle has ejection issues at 3 o’clock—will this help?
A: Possibly. Weak extraction can contribute to erratic ejection. Combine with an ejector spring upgrade for full bolt tuning.
Warranty & Shipping
Sprinco backs this product against manufacturing defects. Domestic orders ship within 1 business day via USPS or UPS. No signature required for delivery. All 50 states compliant.
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