![]() ![]() The Extra Power five-coil spring provides a heavier spring load than OEM springs but can be too aggressive on casings fired in barrels over 18 inches in length. The Enhanced four-coil spring provides extended duty life and is recommended for AR-15 barrels 18 inches and longer. In addition, the spring is treated with a re-micronized molybdenum disulfide plating formulation that inhibits friction and wears. It is heat-treated, stress relieved, and undergoes a post-winding cryogenic process to ensure that the spring can withstand extreme use and temperature fluctuations. The AR-15 extractor upgrade kit is constructed from chrome silicon wire stock. The extractor spring is unaffected by heat up to 750 degrees Fahrenheit and has been proven to maintain performance specifications throughout its effective duty life. The AR-15 extractor upgrade kit is designed for extreme duty applications and has been tested to 200,000 cycles. The extractor upgrade kit comes in four- and five-coil versions to better match your application and is robust enough to outlast the life of your bolt. The Sprinco AR-15 extractor spring upgrade kit is designed for extreme ammo cycling duty in AR-15s chambered for 5.56 NATO. 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.D-Fenderâ„¢ rings are NOT recommended for use with the 5-Coil extractor springs.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.Use 5-Coil spring with either black extractor spring insert OR CRANE Viton O-Rings, but not both.XP 5-Coil spring has a heavier spring load than OEM springs, thus negating the need for a D-Fenderâ„¢ ring or adding CRANE Viton O-Rings. ![]() Extreme duty cycles provided while maintaining performance specifications.Impregnation / plating with re-micronized molybdenum disulfide formulation.Heat treated, stress relieved, and cryogenic processed post winding.Comes with Sprinco extractor spring, black extractor insert, and Mil-Spec Viton O-ring. ![]()
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