The sight has issues - Yankee Hill Machine Gas Block Mounted Flip Sight

At first glance it seems well made but it has some issues. First issue it is made by YHM, they generally make good stuff, including a railed gas block the isn't same plane and also isn't the standard .250 below gas block. That said this sight will only work on YHM gas blocks. I found out the hard way in one sentence of the description it says "any of our gas blocks" but I already opened it so I'm stuck with the pile.

The other issue is while it looks well made it actually all out stinks, the locking button has to be wiggled to make it lock in the up position. Even then the sight moves back and forth about 1/4 inch. So I can't even sell this thing in good concise to anybody biggest waste of money in quit a while.