Osprey Global BDC Elevation Turrets For Compact Riflescopes 308 165 Grain Black CP 308 BDC. These are very easy to use by zeroing your weapon at 100yds and compensating by simply winding the knob counterclockwise to your distance marked on the turret. Specifications for Osprey Global BDC Elevation Turrets For Compact Rifle Scopes: Manufacturer: Osprey Global Color: Black Package Contents: Osprey Global BDC Elevation Turrets For Compact Rifle Scopes Osprey Global Warranty At Osprey Global we will repair or replace your Osprey product in the event it becomes damaged or defective at no charge to you. If we cannot repair your product we will replace it with a product in perfect working order of equal or better physical condition. You see it doesn't matter how it happened whose fault it was or where you purchased it. You can count on our warranty for all Osprey Global rifle scopes tactical scopes compact first focal planes red dots lasers binoculars bore sights and accessories. See Full Warranty Information here. Osprey Global CP 308 BDC: BDC Elevation Turrets For Compact Riflescopes 308 165 Grain Black