I reported this some time ago but didn't have any evidence for it. Then it vanished for some time, probably because i lowered textures to medium. Recently i increased texture quality to high again, which causes the following visual issues for me (RX580 8GB) in ADS:
Doesn't always happen: Textures in the vicinity switching constantly.
Always happens but depends on weapon model (M4A1 is not affected as seen above): Some parts of the gun constantly switching textures.
The texture switching happens roughly in the same timeframe as the gifs indicate.