This gas block replaces your existing front sight and allows the user to mount accessories to its two picatinny rails. This gas block allows the mounting of our forearms without the removal of your muzzle accessory.  Purchase our gas block mounted flip front sight (YHM-9584) to retain your iron sights.

Specifications
It is mounted by the use of four socket head cap screws using a 7/64″ Allen wrench. This gas block has a bore diameter of .750 inches. Made from high quality steel and finished with a Mil. Spec. phosphate coating.