XS Sights Lever Rail Henry Rail .44XS Sights Lever Rail Henry Rail . 44 Compatible with Henry Big Boy X Carbines (all calibers) and Henry Big Boy Carbines in . 44 Magnum and . 45 Colt; Precision CNC machined to mil spec 1913 Picatinny standards; Made from aircraft grade aluminum with a hard coat anodized finish; Lightweight and durable for lifetime use; Allows mounting of scopes, scout scopes, red dots, and LPVOs; Extended rail spans the receiver and forward to the rear sight cut;