Bravo Company Extractor Spring Upgrade Kit Features The BCM Extractor Spring Upgrade Kit centers on a heavy coil chrome silicon extractor spring that is heat treated stress relieved and shot peened delivering the increased extractor tension required for reliable extraction on short-barreled rifles and improving reliability on standard 14.5 and 16 carbine configurations. Chrome silicon construction and the precision manufacturing process employed at a 9001:2000 certified facility ensure consistent spring geometry and tension characteristics across service life without the fatigue and tension loss common in mil-spec replacement springs. The BCM extractor spring is engineered to exceed mil-spec performance standards delivering the reliability demanded by military law enforcement and serious civilian AR-platform shooters. The included black extractor insert is the current standard on AR-15 M4 extractor upgrade platforms including M4 M4A1 Mk18 and the recently updated M16A4 rifle providing a direct replacement that brings the host rifle up to current military extractor configuration standards. A Mil-Spec Crane O-Ring is included in the kit for complete installation without sourcing additional components though the BCM spring s increased tension makes the O-Ring largely unnecessary for reliable function. The three-component kit delivers a complete drop-in extractor reliability upgrade for any AR-15 platform shooter seeking to eliminate extraction failures on short-barreled or high-round-count carbines. Bravo Company Extractor Spring Upgrade Kit Specifications Manufacturer: Bravo Company Model: Extractor Spring Upgrade Kit Compatible Platforms: AR-15/M4/M16/SBR Spring Material: Chrome Silicon Spring Treatment: Heat Treated/Stress Relieved/Shot Peened Manufacturing Standard: ISO 9001:2000 Includes: BCM Extractor Spring/Mil-Spec Crane O-Ring/Black Extractor Insert