Picatinny wire guide designed to allow a cable to pass through a picatinny slot perpendicular to the rail, retained in place and comfortable/unobtrusive to hand placement over the dust cover - such as on a flux raider.
Two versions, one very minimalist and smoothed, one sturdy that can have more clamping force.
Press-fit over the picatinny rail, allowing easy on & off.
The author marked this model as their own original creation.