This firearm was once a floor model gun, and as a result, it has light cosmetic imperfections and is priced accordingly. Billed by its maker as “the most advanced modular AR-15 on the planet,” the MGI MARCK-15 Hydra Modular Weapons System is designed to allow the user to quickly change barrels and easily refit the firearm to accept different types of magazines. It accomplishes this by way of two key innovations: a modular lower receiver that allows different magazine wells to be installed, and a proprietary upper receiver that utilizes a unique locking assembly that allows barrels to be quickly installed and removed. This complete weapon system is ready to fire out of the box. It includes the Modular Lower Receiver with a 5.56mm Magazine-Well, the QCB-D Upper Receiver and a 16-inch barrel with a low profile gas block. With this base system, you can purchase and utilize the rest of ever-growing system including our various magazine wells and caliber conversions. Change barrels in seconds and utilize the correct magazine for the caliber you desire. This Marck15 Hydra comes shipped in a case measuring only 6”x14”x17”, And can easily be assembled in under 1 minute.