I wouldn't say a flashlight is a need. I'd just get a nice RDS. Once you play for awhile and start to see a need for the laser or flashlight, get it then. I've been playing with an aimpoint on my P90 for awhile indoors and outdoors and I've had no problems. Saves some money too.
On the other hand, if you have some spare money, might as well slap them on there. It'd probably be more fun playing indoor games with a light and laser.
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