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MARCK-15 Hydra® .223 / 5.56mm w/ Low Profile Gas Block


This MARCK-15, also known as the "Hydra", is the base system for everything associated with our system.  It includes the MGI® Modular Lower Receiver with a 5.56(AR) Magazine Well, the MGI® QCB-D Upper Receiver and a 16-inch barrel with a low profile gas block, and the MGI® modified bolt carrier. With this base system, you can purchase and utilize the rest of ever-growing system including our  conversion kits. To convert this system the most you will have to change are three components: the barrel, bolt and mag well.  For some calibers  simply change the  bolt and barrel on this system the user will be able to fire 7 plus calibers including .22 rim-fire, .223 or 5.56, 6.5 Grendel, 6.8 Spc, .450 Thumper, .458 Socom, and the .50 Beowulf®.

Add a set of Diamondhead Front and Rear Diamond Polymer Sights by selecting Accessory Options above to the right!  Click picture below for more information.

All Rifles are test fired prior to packaging.

FFL is necessary to make purchase. All Federal and State Rules apply.

California, Massachusetts and New Jersey Residents are REQUIRED to select State Compliant Options.

Shipping Information:

We ship UPS Ground. All Shipping & Handling charges are applied at checkout and will vary based on weight and shipping destination.