The Sig Tango MSR LPVO features Industry leading light transmission and optical clarity for any situation. High Performance 6x optical system with low dispersion glass. Integrated thread in throw leaver 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.