The Troy Gas Block- .875 is engineered by Troy for bull barrel rifles with a 0.875 gas block seat, including Armalite 0.308 heavy barrels and other calibers, delivering a precise, low-profile solution that complements precision-built rifles. Machined from 4140 pre-hardened steel and finished with MIL-STD manganese phosphate, this black gas block offers durable wear resistance and reliable performance in challenging field conditions, while its compact profile maintains a clean heat-management footprint on popular long-range setups. Designed as a true gas block, it ensures stable alignment and consistent system timing to optimize gas capture and cycling across compatible configurations, with a .875" description that reflects its exact seating dimensions. Note that the gas tube roll pin is not included, so installers can tailor the hardware to their preferred gas system configuration. The Troy SGAS-875-00BT-00 combines robust construction with practical compatibility for long gun builds, providing a trustworthy foundation for accuracy-focused rifles. Ideal for shooters seeking a hard-wearing, high-precision gas block that complements Black finishes in Rifle Gas System parts, this component aligns with Troys reputation for dependable, mission-ready performance in the field.