2a Steel Gas Block .625 Bore Blk

The 2A Steel Gas Block .625 Bore in black is a low-profile, durable alternative to titanium designs, delivering proven reliability for AR-pattern rifles. Built from 4140 steel with black phosphate coating, this gas block combines corrosion resistance with a minimal footprint, making it ideal for builds where handguard clearance and weight considerations are critical.

The .625 bore accommodates standard AR gas tubes found on mid-length and rifle-length systems. Its blasted surface finish and black phosphate coating provide excellent corrosion resistance in field conditions, while the low-profile design slides easily under most free-floating and drop-in handguards without fitment complications. Installation relies on a straightforward two set-screw mechanism that secures the block firmly to the gas tube; 2A Armament recommends applying blue locking compound to ensure the connection remains stable under sustained fire and thermal cycling. The compact dimensions (4.25 × 2.75 × 1.25 inches) and minimal weight of 0.13 pounds keep upper receiver balance uncompromised.

This gas block suits builders and shooters prioritizing clean, uncluttered aesthetics without sacrificing function. It performs equally well on precision rifle builds, patrol carbines, and range training platforms. The steel construction offers a cost-effective path for those seeking 2A Armament quality without the premium pricing of titanium, while the black finish coordinates with modern tactical furniture and coatings.

Gas block selection affects both reliability and ergonomics. A properly sized, securely mounted gas block ensures consistent cyclic rate and function across ammunition types. The .625 bore specification is standard for most mid-length and rifle-length builds; users should verify their gas tube diameter before purchase to confirm compatibility.