DOA, cannot open the chassis of the flashlight

I would like to know if someone can guide me through the opening open the flashlight's main body. I think that something came loose during transportation and cannot ship it back because it part of larger set. The flashlight's body seems as whole, dye cast, pressurized to assemply, alluminium. I really don't want to cast aside a $100 flashlight. If someone had a similar issue and could eventually fix it please post the know how.