MSAR (Microtech Small Arms Research) STG-556 semi-automatic rifle chambered in .223 Remington/5.56 NATO. Manufactured in the United States, this bullpup-style rifle is patterned after the iconic Steyr AUG design and features a compact overall length while retaining a full-length barrel. The rifle is configured with an OD Green polymer stock, black receiver assembly, and integrated vertical foregrip. Rifle is equipped with a full-length Picatinny top rail, allowing for the installation of optics, iron sights, or other accessories. The rifle features a fluted barrel with a muzzle brake, quick-change barrel system, ambidextrous-style controls, and a translucent polymer magazine for visual round-count verification. Sling attachment points are present at both the front and rear of the stock.