The Sig Tango MSR is a high-performance 6x optical system with low dispersion glass. It features an integrated thread-in throw lever for quick magnification changes. The illuminated MSR BDC-6 reticle has 11 levels of brightness. Lay-flat flip-back lens covers are included. It offers dependable waterproof, shockproof, and fog-proof performance. Comes with the ALPHA-MSR one-piece aluminum cantilever mount.