An apparatus for mounting a weapon to a support structure comprising a pintle assembly including a slide block; a pintle coupled to the slide block; a pintle lever with a handle and a rod rotatably coupled to the slide block; and a clamp assembly including a fixed jaw having a first end and a second end forming at least one knuckle; a moveable jaw having a first end and a second end forming a pin; and a clamp lever that releasably couples the first end of the fixed jaw with the first end of the moveable jaw; wherein the pin of the moveable jaw is rotatably coupled to the at least one knuckle of the fixed jaw; the pintle lever is rotatably coupled to the fixed jaw of the clamp assembly; and the pintle assembly and the clamp assembly are rotatably and releasably coupled to each other.