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The BUIS found in DayZ.
|Required slots:||1 (1 × 1)|
|Effect on weapon:||• Back up iron sight|
for the weapon
|Compatible with:||• M4A1|
|“|| A simple backup iron sights for the M4 carabine.|
— In-game description
BUIS are generally considered the preferred iron sights for the M4A1, being less obtrusive than the carryhandle and taking up less inventory space.