Unrivaled Adjustable Gas Block .750 Black. 750 is a patent-pending adjustable gas block for .750 AR-15/M16 barrels. Paired with the Unrivaled bullet-tip gas adjustment screw (sold separately offered in multiple lengths to suit different handguards) gas flow can be tuned in the field with nothing more than the tip of a bullet no tools no hex keys. The system is designed so it will not carbon lock and the set screws are designed so they cannot back out and let extra gas through the two failure modes that plague adjustable gas blocks. Machined from stainless steel with a nitride finish and ships with the installation wrench and drill bits. Designed for use with a straight gas tube (sold separately). Pairs very well with the Unrivaled 2 Stage Dead Blow Buffer carrier and Low Signature Device to tune the complete gas path. made in specialized factories. Specifications for Unrivaled Adjustable Gas Block: Manufacturer: Unrivaled Color: Black Gas Block Journal Size-Diameter: .750 in Gun Make: AR Platform Gun Model: M16 Features of Unrivaled Adjustable Gas Block Patent-pending bullet-tip adjustment system tune gas flow with the tip of a round no tools required Bullet-tip gas adjustment screw sold separately available in multiple lengths to clear different handguards Engineered not to carbon lock Set screws designed not to back out or bleed additional gas Stainless steel nitride finish Installation wrench and drill bits included Fits standard .750" gas journal AR-15 / M16 barrels For use with straight gas tubes (sold separately) Package Contents: Unrivaled Adjustable Gas Block Installation wrench Drill bits Set screws Roll pins Storage case (gas adjustment screw and gas tube sold separately) What firearm models does the manufacturer say Unrivaled Adjustable Gas Block is compatible with? The manufacturer suggests that Unrivaled Adjustable Gas Block is compatible with M16Unrivaled UGB-M16-.750: Adjustable Gas Block .750 Black