Sprinco’s Extractor Springs are made of chrome silicon wirestock that has been heat treated, stress relieved, and cryogenic processing post winding. The springs are also plated with re-micronized molybdenum disulfide formulation.
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ADVANTAGES:
- XP 5-Coil spring has a heavier spring load than OEM springs, thus negating the need for a D-Fender™ ring or adding CRANE Viton O-Rings
- Use 5-Coil spring with either black extractor spring insert OR CRANE Viton O-Rings, but not both
- Enhanced 4-Coil springs maintain an extended duty cycle load of a NEW Mil-Spec spring and is recommended for use in 18″”+BBL lengths for those who retrieve their brass for reloading
- While the XP 5-Coil spring is totally reliable for all 5.56 BBL lengths, it can be aggressive on case rims in 18″”+length BBL rifles, and may be too strong for some bolts with extremely tight bolt face tolerances
- Extreme duty cycles provided while maintaining performance specifications
- Unaffected by heat up to 750°F