Introducing the Heckler & Koch MR 556 A 1, a semi-automatic rifle that's a commercial carbine variant of the renowned HK 416 platform. This firearm is a testament to reliability, durability, and precision, with a rich lineage that traces back to the battlefield. Assembled in the U.S. using both German and U.S.-made components, the MR 556 A 1 is the closest you can get to owning the real thing. The MR 556 A 1 employs a proprietary HK short-stroke gas piston system, a significant upgrade from the direct gas impingement system found in standard AR-15 style rifles. This closed piston system prevents exhaust gases from entering the receiver, ensuring your HK runs cooler, cleaner, and more reliably. In harsh conditions with dust, sand, or mud, the superiority of the HK system is undeniable, making it a trusted choice among elite military units, law enforcement professionals, and civilian enthusiasts worldwide. The HK MR 556 A 1 comes in a sleek matte black finish and is packed with features. It operates on a 5.56 NATO caliber (also accepts .223 Remington) and boasts a 16.5" medium-contour cold hammer forged barrel with a 1:7" twist rate. It also features a flat-top optics-ready upper receiver, a 30-round standard AR-15 pattern magazine, a Magpul polymer pistol grip, an ambidextrous safety selector, and an M-Lok free-float handguard. The rifle also has a collapsible stock and weighs 8.60 lbs without the magazine. Choose the rifle that carries the name of Heckler & Koch, a symbol of quality and reliability. Find your HK MR 556 A 1 and other firearms on GunMade.com, the largest online gun search engine for new and used gun prices.