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The Complete MARCK-15-300BO Weapon System.  This configuration of the Hydra is set up for .300 Blackout.  It includes the Modular Lower Receiver with an AR Magazine-Well, the QCB-D Upper Receiver and a 16-inch barrel with low profile gas block, bolt and MGI's modified bolt carrier. With this base system, you can purchase and utilize the rest of ever-growing system including our various magazine wells and caliber conversions. To convert this system to another caliber, you will need to change the barrel, bolt, and magazine well to the desired caliber.  With caliber conversions already available, and many more coming into production, this weapon system continues to grow and become the most versatile Black Rifle platform the industry has ever seen.

 FFL necessary to purchase. All Federal and State Rules apply. California Residents are required to select the California bullet button option.