BCM Extractor Spring Upgrade Kit - 3 PackKit includes: Qty 3 BCM Extractor Spring (chrome silicon, heat treated & stress relieved, shot peened) Qty 3 Crane Ind O Ring (Mil Spec) Qty 3 Black Extractor Insert The BCM Extractor Spring is a heavy coil design made for the increased extractor tension required on many AR15, M4, M16 short barreled rifles. This product also improves the reliability on a standard 16'' and 14. 5'' carbines.
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