The X-RING VR Gen 2 was developed to incorporate some of the desired features sought by their customer base. They approached this update with concept of modularity, creating a suite of in-house optional parts allowing the customer to configure their rifle to meet their shooting needs.Features :Hard Anodized 6061 AluminumStainless Steel BoltDual Symmetrical Recoil Spring and Guide RodLightweight Wasp Firing PinModular Picatinny Rail System