Nikon announced the company is now selling a 1.5-6x 32 scope with a 30mm main tube that is specially designed for the 300 BLK cartridge.  The M-300 BLK scope uses the Nikon BDC SuperSub illuminated reticle.  Illumination is adjustable with 32 levels of intensity.  The reticle is marked in 50 yard increments (hashes) and 100 yard increments (open dots.)  A non-illuminated reticle is also available.

The scopes are waterproof, fogproof, impact resistant and have a limited lifetime warranty.  MSRP is $899.95 for the illuminated reticle and $200 less for the non-illuminated reticle.