ARMS 41-B Silhouette Style Folding Front Sight for M4 Black
[AS2504]

It took some modification to fit my ICS M4 (most things do) and it leaves the R.I.S. a little more shaky than before with the standard triangle sight. It used to be a little shaky when you flipped it open, but i pushed the back part down and KrazyGlue-d it in place, it looks pretty cool.