This Midwest Industries Ghost Ring Sight Set with 1913 Picatinny Rail is designed to fit X model 45-70 variants. The heavy-duty ghost ring offers fast target acquisition. Features a 4" Picatinny rail section and wide windage and elevation adjustment range for use with different ammunition. Does not work with 30-30 models. Not compatible with octagon barrels or brass receivers. Not compatible with Dovetail front sights. FeaturesScrew-in front sight compatibleMidwest Industries sight adjustment tool includedConstructed from Hardcoat Anodized 6061 AluminumSteel rear aperture and front sight post