Looking at at adding a combo green lazer and flashlight to the AR light upper I have for something differnt. NC Star has one that you can change out from one to the other and Barska has a combo that can both be used at once. Who has these out there and whats your thoughts on one to be mounted on side of quad rail or other recommendations. Would like to keep the investment at or below $100 on a single unit and $150 for a combo if possible.