The Superlative Arms patented Bleed Off Mode gas block for the AR-15/AR-10/LR-308 platforms utilizes a unique design that adjusts gas flow by venting excess gas from the front of the block, rather than restricting the flow like traditional adjustable gas blocks. This innovative approach improves reliability and performance across your platform. 0.936 inches x 1 inches direct impingement adjustable gas block Clamp-on 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