The Victor Company Picatinny Rail with QD Cup is designed to mount on Viperskins or the Titan22 stock. These 3" lightweight mini picatinny rails with QD sling mount are cut from bar stock aluminum and hard anodized to give them superior resistance to scratch and denting, providing a universal mounting surface for lights, IR illuminators, night vision devices, sing mounts or anything you might require out in the field.