Although it happens with mods now,since it related to default sight,and there will be some fixed-front-sight rifle soon or later,it's something you should check out.
It's great to see ArmA3 finally have dot sight projected，but still there is some minor issue about it:the dot should not be block by anything in front of the lens,it works when the "thing" is not part of the gun,but when there is a fixed iron front sight in the front of the gun(mod AR,for now),it doesn't work. {F18488}