So lately I've noticing something weird: when pressing both the ads and fire button at the very same time, the fire button doesn't respond. At least one of 3 shots I take, the fire button flickers but doesn't respond, if I try to shoot immediately after ads. This happens only with the AWM, I've never noticed this with any other sniper and I spent countless hours in the training ground in the last few weeks.
I don't know if this bug occurs only in training grounds or not.