Featuring a patented Bleed Off Mode, the Superlative Arms gas piston system bleeds excess gas forward through the block, improving reliability and reducing internal wear compared to standard flow-restrictive systems. 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 Mid-length gas system/operating rod length