MGI manufactures the highly versatile Hydra Modular weapon system which is designed using standard barrels and allows the end user to change calibers without tools in less than 20 seconds. Built upon a complete MARCK-15 base system ready to fire out of the box the Hydra system includes the Modular Lower Receiver with a 5.56mm Magazine-Well, the QCB-C Upper Receiver and a 16-inch barrel. From this base system, officers can purchase and utilize the rest of ever-growing system including various magazine wells and caliber conversions. Change standard barrels in seconds without tools and utilize the correct magazine for the chosen caliber. Simple as changing just a bolt and barrel on this system, the user will be able to fire seven plus calibers including .22, .223 or 5.56, 6.5 Grendel, 6.8 SPC, .450 Thumper, .458 SOCOM, and the .50 Beowulf.
The MARCK-15 also, known as the Hydra, comes in a 7.62x39 AK47 configuration that takes standard AK-47 magazines. All configurations of this weapons system allow for the conversion to different configurations or caliber using standard barrels and magazines. Additional systems include the .45 Hybrid, M3 (Grease Gun) and LE in .45, 9mm and .40 LE (using Glock magazines), 7.62x25 and the .45 Super Mag (.460) gas operated, the AR .223, 6.8 SPC and many others. Further configuration possibilities are available with several magazine wells and caliber conversions already available, and many more coming into production.