The BSA® Sweet 17 3-12x40mm AO is specifically designed for 17-grain .17 HMR bullet and features a generous 4" eye relief for comfortable viewing. Includes an adjustable objective, easily accessible turrets and the preferred 30/30 reticle. Comes equipped with fully coated emerald lenses for clear, bright images and 2-pc. Dovetail rings for mounting. Features a one-piece all aluminum tube that's nitrogen-filled for fogproof, shockproof and waterproof reliability.