Quick view Geissele Automatics Geissele Automatics Super, Geissele 05-807b Supr Gas Block Blk $85.54 $82.00 The geissele super gas block is a low profile gas block, designed to fit under most free floating handguards.Precision investment cast from 17-4 precipitation hardening stainless steel, the gas block provides corrosion resistance and strength to... Compare Add to Cart