I run BUIS on all my rifles, regardless if there is an RDS or LPV on them. Stuff happens and I do not have a rifle which I would not use in a real world situation.
Primary Weapons Systems
Diablo Upper with a PWS CQB Muzzle Device | Knights Armament Micro BUIS
| Midwest Industries Keymod Cover
Diablo Upper with a PWS CQB Muzzle Device | Knights Armament Micro BUIS | Midwest Industries Keymod Cover