5.56 caliber with ambidextrous lower, Combat stock, QD sling attachments, Ambidextrous charging handle, ambidextrous selector and MOE K2 grip. This is a standard build and they are test fired. May take up to 2 weeks to fill the order depending on stock. All rifles are built by Asgard Armory. My lowers are produced by ZRO Delta. Tax is included in the price.