The BSA Sweet 17 AO is calibrated for the .17HMR 17 gr. bullet. This scope features a long eye relief for comfortable viewing, an adjustable objective, as well as the preferred 30/30 reticle. The Sweet 17 comes standard with 2pc dovetail rings and fully coated anti-reflective lenses. Features Include: 3X to 12X Magnification, 40mm Objective, Bullet drop compensating turret, Fully-coated emerald lenses, Adjustable objective, All Aluminum one-piece main tube, Waterproof, shockproof and fogproof, 2 pc. Dovetail rings, One-year warranty.