Current Taser stun guns pack a 50,000-volt wallop—plenty of juice to temporarily paralyze people. Problem is, today’s Tasers are only effective to about 25 yards. But the company is now developing a solution called the eXtended Range Electro-Muscular Projectile. A radically new shotgun shell designed to deliver the combined blunt-force trauma of a fast-moving baseball with the electrical current of a stun gun, the XREP has a current range of 100 feet. The US military, though, has challenged the company to extend the range to a 100 yards.