DDHQ Red Dot Reflex Sight Scope with Quick Detach Mount is a great addition to your accessories. The reflex sight optic and substitute for holographic red dot sights comes in a black finish in aluminum material. The quick detach mount works on picatinny rail systems. The DDHQ Red Dot Reflex Sight Scope with Quick Detach Mount is constructed of aircraft grade aluminum. It also has fan ergonomic design which saves space for other accessories. This sight scope includes: 1x Type Red Dot & Green Dot Sight, CR1620 Battery- 1x Instruction Manual- Allen Wrench- 1x Lens Cleaning Cloth. You can choose between four reticle patterns with red or green color options. The DDHQ comes with a zero set screw, however it should only be used if the zero is not holding and should never be “tightened”. Only turn 1-2 times clockwise, you could risk damaging the unit if turned more. The small hex wrench included.