XM25

http://news.yahoo.com/s/afp/20101201/sc_afp/usmilitaryweaponsafghanistan " The gun's stats are formidable: it fires 25mm air-bursting shells up to 2,300 feet (700 meters), well past the range of most rifles used by today's soldiers, and programs them to explode at a precise distance, allowing troops to neutralize insurgents hiding behind walls, rocks or trenches or inside buildings"

"an enemy combatant pops up from behind a wall to fire at US troops and then ducks behind it, an XM25 gunner can aim the laser range finder at the top of the wall, then program the shell to detonate one meter beyond it, showering lethal fragmentation where the insurgent is seeking cover."

"The Pentagon plans to purchase at least 12,500 of the guns -- at a price tag of 25,000 to 30,000"