The BSA Sweet scopes use trajectory compensation technology that was originally designed for military sniper. They feature a quick change turret system specially calibrated for multiple grain weights for the calibers .17HMR .22LR .223 .243 .270.The BSA Sweet 22 AO Compact is designed for the Ruger 1022 and other smallframe .22 rifles. It features a long eye relief for comfortable viewing an adjustable objective as well as the preferred 3030 reticle. It comes standard with 2pc dovetail rings and fully coated antireflective lenses all in a onepiece aluminum housing.