The BSA 1739X40AO is from our esteemed BSA Sweet scopes range, integrating trajectory compensation technology initially devised for military sniper usage. With a unique quick change turret system, it\'s calibrated for various grain weights for different calibers including .17HMR, .22LR, .223, .243, and .270.The BSA Sweet 17 AO is designed with a comfortable long eye relief and an adjustable objective. It boasts the much-preferred 30/30 reticle. The default package includes 2pc dovetail rings and has fully coated anti-reflective lenses. All these features are neatly encased in a single-piece aluminum housing for durability.