US Patent 7322141 Rotating fore grip for small arms

A firearm includes a barrel that has a central axis, a receiver fixedly supporting the barrel, a gunstock that is connected to the receiver and that comprises a longitudinal axis, and a shoulder stock extending in a plane that is generally perpendicular to the longitudinal axis of the gunstock. The gunstock and the receiver may each be configured to provide for angular movement of the gunstock relative to the receiver and, in turn, the barrel whereby the central axis of the barrel varies in a generally radial direction extending from the longitudinal axis of the gunstock. In this way, the firearm may be discharged by a warfighter, standing adjacent to a corner, around the corner.