Compatible with Picatinny and Weaver-style rings, the Leupold BackCountry Cross-Slot 1-Piece Base for Tikka T3/T3x Rifles offers secure attachment to your firearm. The matte-finished base is constructed from 7075-T6 aircraft-grade aluminum for heavy-duty strength. Leupold BackCountry Cross-Slot 1-Piece Base for Tikka T3/T3x Rifles Black - Scope Rngs And Rifle Accessories at Academy Sports