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Your comes completely assembled. Disassembly only will be required when changing batteries or the bulb.

This Stinger is constructed of machined aircraft aluminum and meets FL1 standards for water and impact resistance. A deep-dish parabolic reflector produces a concentrated beam with optimum peripheral illumination. Streamlight Stinger DS LED HL features

https://en.wikipedia.org/wiki/Rechargeable_battery

Galls Rechargeable Tactical Flashlight