AR-15 Solid Adjustable Gas Block by Superlative Arms. Bleed Off mode direct impingement gas block for the AR-15/AR-10/LR-308 platform. Adjusts gas by bleeding gas forward from the block instead of restricting flow. Features a patented detent located outside the block. The gas adjustment screw does not restrict flow and helps prevent detent loss due to carbon buildup. Includes one assembled gas block, two 10-32 x 1/4" set screws, one gas tube roll pin, one 3/32" x 6" L-shaped hex key, and installation instructions. Gas block material options include 416 stainless steel or titanium.