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Ruger's AR-556 Semiautomatic Tactical Rifles boast a matte-black 16" medium-contour cold-hammer-forged barrel with ultraprecise rifling that delivers exceptional accuracy, longevity and corrosion resistance. Durable synthetic stock and heat-resistant, glass-filled nylon handguards withstand wear and tear for long-lasting performance. Ergonomic pistol grip and six-position, telescoping M4-style buttstock provide an excellent hold. Low-glare milled gas block located at a carbine-length (M4) position offers improved balance and handling. Flat-top upper receiver with forward assist, dust cover and brass deflector. Also features matte black-oxide bolt carrier with staked gas key. Elevation-adjustable front sight and Rapid Deploy folding rear sight. Multiple adjustment points for many sling and accessory options. Includes one 10-round or 30-round Magpul PMAG® magazine and front-sight tool. AR-556 is direct impingent.