Bravo Company SOPMOD Bolt Upgrade and Rebuild Kit Features The SOPMOD Bolt Upgrade and Rebuild Kit includes a USGI-spec shot peened extractor extractor pin BCM extractor spring in chrome silicon with heat treating stress relieving and shot peening three USGI gas rings a Mil-Spec Crane O-Ring and a black extractor insert standard on current M4 M4A1 Mk18 and M16A4 platforms. The BCM chrome silicon extractor spring delivers increased extractor tension over standard mil-spec springs reducing extraction failures on short-barreled rifles and improving reliability on 14.5 and 16 carbines across high-round-count use. Every component in the kit is manufactured to USGI or BCM specifications ensuring drop-in compatibility and reliable function across any AR-15 M4 or M16 bolt assembly. The USGI gas rings and shot peened extractor on this AR-15 bolt rebuild kit address the two most common wear points in a high-round-count bolt assembly restoring gas seal integrity and extraction reliability to factory-spec performance without replacing the entire bolt. The black extractor insert brings the host rifle up to current military extractor configuration standards as a direct drop-in replacement. Keeping a SOPMOD Bolt Upgrade and Rebuild Kit in the range bag or field kit ensures critical bolt components are always available to restore an AR-15 to full reliability without returning to an armorer. Bravo Company SOPMOD Bolt Upgrade and Rebuild Kit Specifications Manufacturer: Bravo Company Model: SOPMOD Bolt Upgrade and Rebuild Kit Compatible Platforms: AR-15/M4/M16 Includes: USGI Spec Shot Peened Extractor/Extractor Pin/BCM Chrome Silicon Extractor Spring/3x USGI Gas Rings/Mil-Spec Crane O-Ring/Black Extractor Insert