Vortex StrikeFire Red Dot Scope for AR15 SF-BR-AR15

Fully multi-coated lenses increase light transmission with multiple anti-reflective coatings. 30mm one-piece tube allows greater windage & elevation adjustments plus greater strength. Extra-high ring height puts scope's bore center 40mm above the base height. Waterproof optics are O-ring sealed to prevent moisture, dust & debris from getting inside. Nitrogen purged to inhibit internal fogging. Parallax free design allows for rapid shooting with both eyes open - no parallax shooting error.