This thin Picatinny rail segment is designed specifically to add backup iron sights for Hoplite low profile handguards. It maintains precise alignment with the upper receiver when installed at the 12 o’clock position. A special flanged fastener locks it securely in place while staying out of the way of your gas block. This part is tightened from the inside – to hide the bolts – so we recommend installing it before attaching your Hoplite handguard to the rifle. Hard-anodized black for durability, the rail and fasteners weigh 0.8oz total.