I guess this bug doesn't matter, but you could look into it. The suppressor is a great item to add, but when you kill somebody with the suppressor on the M4A1 and you pick it up, sometimes the suppressor will stay there, but won't show up on your screen. So when you add it, it will show it, but it won't work. Idk, it's a small bug, but it happens sometimes and it gets really confusing.

Literally wah. I'm pretty sure if you toggle the suppressor on and off it shows correctly again, even if not still wah.