Similar to the Tactical Flashlight, make a laser attachment that is toggled between states by the user aiming down their sights. In night games, this would allow people who prefer to use the point aiming system while using NVGs to keep their laser off while running around, while guaranteeing it'll be useful while aiming without needing to remember to press a button for it.
If possible, have it only turn on when point aiming, so it doesn't switch on if the player is using the primary scope mounted on their weapon for whatever reason (if someone is using the FLIR sight during a night game, for example)
This could also be useful if the devs plan on making lasers visible to other players outside of night modes.