Blackpowder Products See-Thru Durasight Z-2 Alloy In-Line 2-Piece Base System for Muzzleloaders (Black) Durasight Z-2 Alloy In-Line 2-Piece Base System for Muzzleloaders - See-Thru - (Black) Fits all CVA, Winchester, Traditions & New Frontier In-Line Muzzleloaders