Chambering: 223 Wylde for 5.56 NATO or 223 Rem 16″ barrel, mid-length gas system, nitride finish. 13.7″ slimline M-LOK handguard, ambidextrous controls. Features QMAG-53 quad-stack mag with 80% more capacity than standard 30-rounders. QMAG-53 fits standard pouches. Lite model is 6.65 lbs, 31.875″ long. Values are for the Quattro variant; subtract 49% for the Lite variant.