Sprinco Usa M16/m4 Extractor Spring Upgrade Kit
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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. 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 D-Fender™ rings are NOT recommended for use with our 5-Coil
extractor springs. Dual spring XP .308 extractor spring sets may be
used with or without CRANE O-rings. May be required for use in DPMS G2
Bolts for full-auto use. Plug & play - May easily be the only
extractor springs needed for the life of your bolt!!