This Yankee Hill Gas Block with Sight and Bayonet Lug has a rounded hooded front sight guard that helps you sight faster, and more accurately. Yankee Hill understands the demanding conditions that sights and weapons have to endure, and as such they designed this gas block with all steel construction. A simple push button either conceals the sight or locks it up in the deployed position once its flipped up. The two part design allows this to be mounted to weapons with welded or pinned muzzle accessories. Mount it easily with 4 cap screws. Have your cake and eat it too with this sight weighing the same as normal sight towers!