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The BUIS found in DayZ.
Required slots: 1 (1 × 1)[1]
Effect on weapon: • Back up iron sight
for the weapon
Compatible with: M4A1[1]
Location(s): Military[2]
Rarity: Rare
A simple backup iron sights for the M4 carabine.
— In-game description[1]

The BUIS, or back up iron sight, is a type of sight attachment for the M4A1 assault rifle.


The BUIS occupies one inventory slot.[1] It can be rarely found in military type loot spawns like control towers and barracks.[2]

BUIS are generally considered the preferred iron sights for the M4A1, being less obtrusive than the carryhandle and taking up less inventory space.

Image gallery

BUIS An buis in pristine condition.

See also


  1. 1.0 1.1 1.2 1.3 DayZDB, BUIS, viewed 7 March 2014, <>.
  2. 2.0 2.1 DayZDB, Chernarus+: BUIS, viewed 7 March 2014, <;item=BUIS>.