Gas block has a .750" internal diameter. For use with DPMS Heavy, AP4 and light barrel contours.

Specifications and Features:
Allows the use of rail mounted accessories such as detachable or flip up front sights.
Hardcoat black anodized finish
Gas Block does not fit DPMS Bull Barrels (.936" dia), 1.9" Long, 2.5 Ounces.