Leupold Gunmaker Rifle Scope Bases are intended for those who embrace the philosophy of one hundred percent customization. With these unique bases, you get the freedom to tailor your scope mounting system to specific configurations. There are no pre-drilled holes or fluting, which affords you the freedom to custom drill holes, cut to length, cut flutes, and cut a specific radius. Our classic gunmaker base is similar to our STD 2-piece bases. The front base accepts a dovetail ring, and the rear base houses the windage and adjustment screws (Dovetail and Windage Models Sold Separately).