The HK MR556 A4 Short Barrel Rifle is a modern 5.56×45 mm NATO platform built on Heckler & Koch’s proven rifle lineage, featuring an 11″ barrel for a compact profile that balances maneuverability with ballistic performance. The A4 designation typically denotes a flat-top upper with a full-length Picatinny rail for easy mounting of optics and accessories, paired with a free-float handguard and modular attachment points for mission lights, grips, or other gear. Designed with an adjustable stock and ergonomic controls, the MR556 A4 supports versatile handling across dynamic shooting scenarios. This configuration includes one 30-round magazine, offering standard capacity for training or duty applications where permitted. With precision engineering and robust construction, the MR556 A4 Short Barrel Rifle delivers dependable performance and adaptability in a compact tactical package.