This gas block replaces your existing front sight and allows the use of dovetail mounted accessories. Installs easily with two cap screws onto barrels with a diameter of .625 diameter under the front sight. Purchase our dovetail mounted flip front sight (YHM-9584) to retain your iron sights.
Made from high quality steel and finished with a Mil. Spec. phosphate coating.
Made in the U.S.A.
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I've been using YHM clamp-on gas blocks on my own rifles/MGs and installing them on customers guns for years. They're very well made and reliable.