- 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 oad of a NEW Mil-Spec spring and is recommended for use in 18″+BBL lengths for those who retieve 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
- Plug & play – May easily be the only extractor springs needed for the life of your bolt!!
This kit comes with one 5 Coil HD spring and black viton insert. It is standard in all of our BCGs