XS 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;Maintains a clear sight channel for front and rear sights;Requires removal of factory rear sight for installation;Designed for steel receivers with round barrels;Includes lever rail, screw kit, pillar assembly, hex wrench, blue threadlocker, and instructions;Screws torque to 20 inch-pounds for secure installation;Made in the USA for American-made riflestable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Item Category Code: 4000 Product Group Code: 4000C Product Sub Group 1: 4000C2 Inactive: No Prop65 Applies: Yes Prop65 Cancer Harm: Yes Prop65 Chemical: Lead