The Adjustable gas block for .936 diameter barrel is constructed of 1141 high strength steel with a magnesium Phosphate finish. Gas block #10-32 adjustment set screw. Gas block held in place by 2 10-32 set screws. Gas block is 1.165" tall 1" in length and is .780" from bore center to gas tube. Block is 1.155 in width and comes with rollpin.  This gas block is to tall to fit under most handguards because of the additional height for the adjustment screw between the gas tube and barrel. This set up works on AR15 rifle length gas systems and DPMS 308 gas system lengths.  From the back of the gas block to the gas port hole is .250.  This leaves .035 between the back of the gas block and most steps in the barrel.  This is for installing of the A2 style hand guards.  So there should be a .035 gap between the barrel step and the gas block.  This can be filled with spacer or leave empty.  The overall length of the straight gas tube is 15.165"