NcStar 45/ 90/ -45 Side to Side Vertical GripFeatures:- New innovative design: 45/ 90/ -45 Side to Side Vertical Grip- With a push of a spring loaded button, the Vertical Grip can be turned sideways 45 from vertical in either direction. Vertical Grip locks in place (3 positions).- Works great with the VISM DUO optic or for offset reflex optics set at 45.- Improves the ergonomics. More comfortable grip when using Drum Magazines.- Mounts onto Weaver/ Picatinny/ MIL-STD 1913 rails.- Mount and pivot mechanism is all metal construction.- Vertical Grip handle made from Black Polymer. Vertical grip has a bottom plug with an O-Ring for a waterproof storage compartment, space for spare batteries, spare parts, and tools.- US Patent Pending