Out of stock
SKU: 2A-STGB-3
UPC: 854361006795
The 2A Armament 2A Steel Gas Block .875 Bore is a low-profile, direct-impingement gas regulation component designed for AR-15 and similar platform rifles. Built from 4140 steel and finished with black phosphate coating, this gas block delivers the same proven design philosophy as 2A's titanium variants while offering a cost-effective, durable solution for shooters building or upgrading rifle systems where space constraints demand a compact profile.
The .875-inch bore diameter accommodates standard mid-length gas tubes found on most AR platforms. Manufactured from 4140 steel—a chromium-molybdenum alloy chosen for its strength-to-weight ratio and corrosion resistance—this gas block is then blasted and phosphate-coated to create a durable black finish that resists oxidation in field conditions. The low-profile design minimizes clearance issues when installing under tight-fitting handguards or in space-restricted mounting positions. Dual set screws provide a straightforward clamping mechanism, and 2A recommends blue threadlocker compound during installation to ensure the block remains positively secured against the barrel through the recoil cycle and sustained firing.
This gas block suits mid-range builders who prioritize functional design and material durability without premium material costs. It performs equally in patrol rifle builds, carbine training setups, and general-purpose rifle platforms where gas regulation accuracy is standard across the AR ecosystem. The compact footprint makes it particularly valuable for builds using modern free-floating handguards with minimal internal clearance—a common constraint in precision and tactical rifle configurations.
2A Armament's gas block lineup reflects a philosophy of delivering engineered components without aesthetic compromise. The steel version maintains the same mechanical precision and installation simplicity as the titanium option, making it a practical choice for shooters who value reliability and ease of installation over exotic material specifications.
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