Picatinny rails have become one of the most used mounts on the market. The material from which the rail is made is aluminium or steel.
Scope Mounts - Picatinny Rails
Picatinny rail - Aluminium or Steel - Optics Trade Blog
Seekins Precision Remington 700 Short Action Picatinny Rail - 20
Rail Picatinny compact 45 degrés Vector Optics, rail picatinny
Aluminium VS steel picatinny rail
Rail Picatinny compact 45 degrés Vector Optics, rail picatinny
Rail Picatinny compact 45 degrés Vector Optics, rail picatinny
Aluminum M-L-ok Picatinny Rail,5-Slot 9-Slot 13-Slot Lightweight
Marlin Henry Rossi 95 Picatinny Rail Mount
MOE STYLE RAILS KINETIC RESEARCH GROUP ALUMINUM L2 PICATINNY RAIL
Picatinny rail - Aluminium or Steel - Optics Trade Blog