With ability to rapidly change calibers, barrel lengths and stock configurations, the Bushmaster ACR adapts to varied conditions like no rifle that has come before it. In minutes, without tools, it will go from 5.56mm to 6.8mm to 6.5mm by swapping the bolt head, barrel and magazine. With an exchange of stocks, barrels and accessories, it transforms from a close quarters weapon to a designated marksman platform. Simply put, the Bushmaster ACR is the highest evolution of modular rifle utility. This rifle is built specifically for law enforcement and tactical applications - with Bushmaster's unrivaled standards for durability and precision. They've nearly doubled barrel life and reduced maintenance with the addition of an innovative protective coating. This is also featured on action components for dramatically reduced wear and enhanced operation. For the ultimate blend of strength and reduced weight, they used rugged, high density composite for the hand guard, lower receiver and stock. The heart of the ACR is their gas piston operating system. It's torture tested and proven reliable in the most brutal conditions on the planet. From the magazine release and fire selector to the non reciprocating charging handle, ambidextrous controls optimize user effectiveness. Add Bushmaster's hallmark commitment to quality down to the slightest ingredient, and you have a platform that's a natural fit for any operator and every mission.