The Geissele SPDTY MOD1 is a semi-auto AR rifle chambered in .223 Rem/5.56 Nato. It features a 14.5-inch barrel with a 1:7" rate of twist and comes in a sleek black finish.Key FeaturesBarrel Length: Fitted with a 14.5-inch barrel.Caliber: Chambered in .223 Rem/5.56 Nato.Action: Semi-auto action for reliable performance.Safety: Equipped with an ambidextrous safety for versatility.Model: This rifle is part of the SD556 model line.