Magpul MBUS flip up rear sight (picatinny)

The Magpul MBUS (Magpul Back up Sight) is the original lightweight fold down back up Iron Sight for Picatinny rails

Manufactured from Magpul's famously tough polymer the spring loaded sight comes with an adjustment tool but is also compatible with A2 tools.

When the spring loaded sight is flipped up the sight is same height as M4 A2 iron sights.