MGI Hydra Multi-Caliber Rifle
This guide details the tool-less conversion process for the MGI Hydra Multi-Caliber Rifle, as demonstrated by Mack Gwinn. It covers swapping barrels, bolt carrier groups, and magwells to change calibers between 9mm and 7.62x39mm, highlighting the system's modularity and AR-15 compatibility. The demonstration emphasizes maintaining standard AR-15 controls throughout the caliber changes.













