The Nikon M223 Rifle Scope is a tactical scope designed for use on AR-style rifles or tactical bolt action rifles. The scope features Nikon's Ultra ClearCoat Optical System to provide up to 95% light transmission, 4 inches of constant eye relief and a sturdy 1-piece tube. Another feature of the M223 is the new return to zero turrets which simplify adjustments for different ranges at the range or in the field. The Nikon M223 Rifle Scope is covered by a lifetime factory warranty. These Nikon M-223 Rifle scopes are all engineered for the 223 Rem./5.56mm NATO round with 55-grain polymer tip bullet. These Rifle scopes are waterproof, fogproof and shockproof, in addition, this Nikon Rifle scope comes in your choice of a Nikoplex reticle or BDC 600 Reticle.