Nikon make a scope specifically for the .223, have a look...
Nikon M223 3-12 X 42 Black Matte, Nikoplex Reticle, 8488, Rifle Scope: Arcadian Sales
Type: Posts; User: Spudattack
Nikon make a scope specifically for the .223, have a look...
Nikon M223 3-12 X 42 Black Matte, Nikoplex Reticle, 8488, Rifle Scope: Arcadian Sales