YHM-9383 or YHM-9384 Low Profile Gas Block AR15

These gas blocks replace your existing front sight to provide a simple, low profile design that can be used to mount a rifle length AR-15 forearm to a carbine length barrel. They are mounted either by the use of two set screws (YHM-9383) or 2 clamping screws (YHM-9384) and are .950 Inches long. Manufactured from high quality steel and finished with a mil. spec. phosphate coating. Made in the U.S.A.