FITS : Henry Steel Frame Big Boy round barrel carbines Std & X series chambered in .44 Mag & 45 LC and also Big Boy X carbines chambered in .357 Mag The XS Sight Lever Rail is required when installing XS Ghost Ring Sights on your Henry rifle (optional) Designed for steel receivers. Due to differences in receiver dimensions and barrel contours the XS Lever Rails for Henry rifles are caliber specific. They will only work on rifles with steel receivers and round barrels.The XS Sights Lever Rail offers unparalleled options for scope mounting. Featuring mil standard 1913 mounting slots the Lever Rail can be used to mount conventional scopes low powered variable optics (LVPO) scout scopes or red dot sights.The lightweight aircraft grade aluminum alloy construction and hard anodized finish will provide you with a lifetime of service in any environment. When paired with their ghost ring sights you'll have the most versatile sighting setup possible. Lightweight aluminum rails are hard anodized for durability Picatinny spec rail allows for scope or red dot mounting Proudly manufactured in Fort Worth TX