The BSA 17312X40AO is a highly sophisticated scope that uses cutting-edge trajectory compensation technology, which was initially developed for military sniper usage. It showcases a versatile quick change turret system that has been expertly calibrated for multiple grain weights, suitable for a variety of calibers including .17HMR, .22LR, .223, .243, .270.One of the many noteworthy features of the BSA Sweet 17 AO is its long eye relief which provides a comfortable viewing experience. It also sports an adjustable objective and a 30/30 reticle, which is a preferred choice among users. This remarkable scope package comes complete with 2pc dovetail rings and lenses that are fully coated to counteract reflections.All these impressive aspects are conveniently housed in a durable, one-piece aluminum structure, ensuring that the BSA 17312X40AO truly stands out in terms of both functionality and design.