a great combination for your NVG scope would be a cheap visible laser ( you can buy an IR one if you can afford it), or you can use a Infrared Filtered flashlight to illuminate and mark your targets.
Also consider a suppressor. It will help contain the muzzle flash, help control muzzle flip, and not alarm those within earshot of your nocturnal activities.
Then there’s the little gizmo that detects body heat. I don’t think they’ve combined it with a set of cross hairs yet, but that may work better if you can find one.