The STAAG 20mm (Front) 21mm (Rear) mic array is now available. This mount is designed to be compatible with a variety of shotgun microphones in the rear-facing position. http://shpws.me/OtD7
STAAG is a microphone array that combines two ORTF arrays (one forward-facing, and one rearward facing). The concept is that the rear-facing component's amplitude may be adjusted to add or subtract natural room ambience. - http://shpws.me/OqSp