ClassicFirearms introduces the H&K MR556A1, the civilian version of the highly sought-after HK 416 rifle. Originally developed in the early 2000s, the HK 416 replaced the M4's direct impingement system with a more reliable short-stroke piston-driven system, becoming a preferred weapon for special operations units. The MR556A1 mirrors these features with its 16-inch cold hammer-forged barrel and robust piston system.