Abstract: A device for moveably securing a weapon to a vehicle comprises a mounting platform having a frame, a rail, and a carriage selectively slidable, and optionally selectively lockable, along the rail; a swing arm assembly supported by the carriage, the swing arm having first and second elongate arms connected via a pivot joint, the second arm connected to, and supported by, the carriage via the first elongate arm; the second arm forming a first portion of a pintle connection that rotatably supports the weapon; the pivot joint including a locking mechanism operative to selectively lock the second arm relative to the first arm. The pintle connections of the device may use non-tapering pintles. The device may further comprise a yoke rotatably coupled to the second arm via the first portion of the pintle connection, the yoke adapted to rotatably support the weapon. Methods are also described.