The BUIS, or Back Up Iron Sights, only attaches to the M4A1 in the optic/sight attachment slot. This means it can't be used as an iron sight in addition to having an optic attached.
- M4A1 -
Weapon attachments in DayZ can also impact weapon stats significantly, adding an element of customisation when selecting your weapon loadout.
DayZ Attachments vary a lot, but can be categorised into 6 different weapon attachment categories. These include Optics/Sights, Muzzles, Buttstocks, Handguards, Other and Magazines.
A single DayZ Weapon Attachment won't make much of a difference to your weapon unless it's an optic for improving weapon zeroing, or a muzzle for reducing your weapon sound.
View all of Asmondian's infographics to learn a lot about DayZ quickly
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