Sig Sauer Electro-Optics Tango-MSR LPVO is a high performance 6x optical system with low dispersion glass. Featuring an integrated thread in throw leaver for quick magnification changes, illuminated MSR BDC6 reticle with 11 brightness levels and is waterproof, shockproof and fog proof. Includes lay flat flip back lens covers and an ALPHA-MSR 1 piece aluminum cantilever mount.