Ergo Grip Pop Bottle Vertical Forward Grip Black. These Long Gun Grips manufactured by the experts at ERGO are made of hard polymer and slide onto a Picatinny rail and are secured with a cross bolt. Specifications for Ergo Grip POP Bottle Vertical Forward Grips: Manufacturer: ERGO Finish: Anodized Gun Make: AR Platform Gun Type: Rifle Gun Model: AR-15 Material: 6061-T6 Aluminum Fabric/Material: 6061-T6 Aluminum Width: 2 in Height: 9 in Mount Type: Picatinny Gun Rail: Picatinny Features of Ergo Grip POP Bottle Vertical Forward Gun Grip: Injection molded Vertical Forward Grip extremely durable and tough Slide rail mount to Picatinny rails with cross bolt section Package Contents: Ergo Grip POP Bottle Vertical Forward Grips Includes mountaing hardware. Ergo Grip 4253-BK: Ergo Pop Bottle Vertical Forward Grip-black Black