Re: ADR Bipod Annoyance/Fire Rate
@ATFGunrXsX here. No comment on the deployed status, as I don't use the bipod.
However, on Xbox at least, Deploy BiPod (or switch to launchers) is hold down "Down" on the + pad. But, press down the "Down" button and it switches firing modes.
Many Many times I have "deployed" the underbarrel, only to find I didn't hold it down long enough, and switched from auto to single fire.