Hooooooooly sheep shit Batman, that is one bad little motherfucker.
The XM556 Microgun was designed at Empty Shell “one guy over the last two and a half years with no training, no college, just a GED” and it is what every American has dreamed of since he first saw Predator and watched the forest get melted by a minigun.Snip
The XM556 is a new platform system that was designed from scratch by the ground up. The parts are not just a smaller imitation of the larger M134, but were designed on its own. An absolutely all new style of bolt was conceived and designed to eliminate current known issues with the M134. The bolts combined with many other improvements have been made to not only extend the life of the gun but reduce wear and reduce or eliminate stoppages.
H/T SurvivalBlog for the link.