The flat box thing is the AN/PEQ-2. It has an infrared laser, and an IR flashlight. The user can select either or both, and the light is focusable. The SureFire I think is just the universal weaponslight. Also the little round thing behind the PEQ-2 is the Aimpoint M68 Close Quarter Optic, a red dot sight. He should also have a flip up iron sight (the BIS- Backup Iron Sight) behind the M68, just outside the photo's limit.
Edited for a correction and to add some minor details.