The Superlative Arms patented Bleed Off Mode gas block provides a groundbreaking approach to gas flow regulation for AR-15, AR-10 and LR-308 rifles. Unlike traditional adjustable blocks that restrict flow, this gas block vents excess gas out the front, leading to smoother cycling, less recoil and reduced internal wear for a more reliable rifle. 0.875 inches x 1 inches direct impingement adjustable gas block Solid, set screw attachment type Gas adjustment (patented) - features 30 fixed positions located at the front of the block Bleed-off port (patented) - located at the front of the block, designed to vent forward, directing emissions away from the operator Matte finish on gas block