Harnessing innovation and precision engineering, the Superlative Arms patented Bleed Off Mode gas piston system refines AR-15 performance by venting excess gas forward, ensuring efficient operation with minimal internal strain. 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 3/4 inches x 1 inches solid set screw QPQ melonite 416 stainless steel piston gas block Right hand, full-automatic AR-15 bolt carrier, dark DLC 8620 steel Pistol gas system/operating rod length