Did you happen to check to see if your gas plug screw was tight? If this is loose, the whole gas cylinder can move, and accordingly, your front sight. While you're at that end of the rifle, check the front sight screw. Also, you may want to check your op rod piston, it might be at the edge or out of spec, thus leaking too much gas and effecting the op rod action. HTH, KarlKW
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