6-18x40 AO Hot Magnum Black Matte 30/30 Engineered with revolutionary Bullet Drop Technology interchangeable .22 BDC elevation knobs for 40GR 38GR and 36GR .22 bullets high density optical glass for crisp edge-to-edge clarity Pre-calculated trajectory compensation from 100 to 300 yards multi-coated optics for brighter viewing and adjustable objective (AO) for parallax correction Backed by BARSKA's Limited Lifetime Warranty.