The switching of mods only takes a second, which means players do not have to worry about it being a long process that could get them killed in a battle.
Doing this action will then cause the Slayer to change the mod that is currently equipped on the weapon you are using. All that you need to do to change a mod on a particular firearm is to hold down the F key on PC or press up on the D-pad on Xbox One or PlayStation 4. The process of switching a mod is not a difficult one and can be done amid an intense firefight.
How to Switch Weapon Mods in DOOM Eternal