High Performance 6x optical system with low dispersion glass Integrated thread in throw lever for quick magnification changes Illuminated MSR BDC-6 reticle with 11x brightness levels. Lay flat flip-back lens covers included Dependable waterproof, shockproof, and fog-proof performance. Includes ALPHA-MSR 1 piece aluminum cantilever mount. Product Specifications Brand: Sig Sauer Series: TANGO MSR Power/Fits: 1-10 Objective: 28mm Tube Diameter: 34mm Reticle: Illuminated BDC 10 Finish: Black Features: Alpha-MSR Mount & Flip Caps Second Focal Plane