The army abandoned their search for an M16 replacement last year, but a man working out of his garage in Colorado Springs snapped them out of that hiatus. Martin Grier's "ribbon gun" features 4 6mm bores carved out of a single steel barrel, and special ammunition blocks fired by electromagnetic actuators. Despite all that, whole thing only weighs 6.5 pounds and represents a $500,000 investment. Grier claims the prototype can fire 250 rounds a second, or fire all 4 barrels at once as a "power shot". The rifle will still work even if one of the barrels fail. The Army expressed interest in the design, and asked for a prototype to test for themselves. "A multibore firearm, with several bores within a single barrel, could potentially exhibit many of the advantages of a multibarrel design, while reducing the size, weight and complexity disadvantages," Grier wrote in his 2016 patent application. "All the best stuff comes out of somebody’s garage," he said.