Leupold Dual Dovetail 2-Piece Ring & Base Set The dual dovetail set with medium 1" rings & base for Thompson Center Encore, Omega from Leupold inc The base employs Leupold's "Dual Dovetail" mounting system, with two identical slots at either end Specifications: - Fits: Thompson Center Encore Bolt Action Pistols and Rifles / Omega Muzzleloade 77" - Mounting System: Dual Dovetail (Twist-in slot front and rear) - Construction: Steel - Finish: