Ultradyne USA Quantum Adjustable Gas Block – .750" Diameter

The Ultradyne USA Quantum Adjustable Gas Block gives shooters precise control over their AR-15's gas system without tools or disassembly. This .750" diameter block allows on-the-fly tuning to optimize cycling with different ammunition loads, suppress configurations, or to reduce recoil and brass ejection violence. Whether you're running suppressed one day and unsuppressed the next, or switching between factory loads and handloads, this gas block eliminates over-gassing issues that cause premature wear and uncomfortable recoil impulse.

Machined from steel with a corrosion-resistant finish, the Quantum features a precision-click adjustment mechanism accessible from the exterior. Installation is straightforward for anyone comfortable with basic AR assembly—the block clamps to standard barrel journals and indexes with a set screw system. No permanent modification to the barrel is required. The low-profile design fits under most free-float handguards.

• Part Type: Adjustable Gas Block
• Compatible Firearms: AR-15 platforms with .750" diameter gas journals
• Material: Steel
• Finish: Corrosion-resistant coating
• Installation: Drop-in for users familiar with AR assembly; no gunsmithing required
• Includes: Gas block, mounting hardware, adjustment tool (if applicable—confirm with packaging)