Yankee Hill Front Flip Up Sight Tower with Lug
These front sights feature either a round hooded front sight guard that allows for fast and accurate sighting or a standard style front sight guard. They sight base features all steel construction for superior strength in demanding conditions.The flip sight is easily concealed with the push of a button. It flips up and locks in the deployed position. This sight accepts all standard AR sight posts and hardware (Included). With this setup you get the convenience of a flip front sight with the same weight as a standard AR sight tower. This sight’s two-piece design allows it to be mounted on firearms with pinned and welded muzzle accessories. It mounts easily and securely with four cap screws using a 7/64" Allen wrench. These gas blocks have a bore diameter of .750 inches.
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This is my preferred gas block to use for builds.
Very sturdy flip up front sight that also includes gas block. Easily installed and works well with any standard height rear sight. Makes a nice addition to any standard military style carbine configuration where you want the front post out of the way for scope use.
I've used this YHM flip-up front sight post on six builds. They look good, hold a zero and stand up to hard use. The first one I installed on my LR-308 about seven years ago. That rifle gets used regularly - and I'm not gentle on it. The YHM front sight still works perfectly.
Really well made gas block and front sight
Have used these for several years and find them the best value on the market. Surplus has very competative prices as well.