MGI Hydra Multi-Caliber Rifle
The MGI Hydra is a highly modular rifle built on the AR-15 platform, allowing for tool-less caliber swaps. It demonstrated conversions to 9mm and 7.62x39mm by swapping barrels and magwells. The system retains standard AR-15 controls, enhancing user familiarity and muscle memory across different calibers. Its design concept dates back to the Vietnam War, aiming to utilize enemy ammunition.









