Our Hydra® Complete Modular Lower without Magazine Well offers the ability to change Magazine Wells on your Lower Receiver to accommodate whatever caliber you want.  Ideally suited for use with the Hydra® Quick Change Barrel Upper Receiver (QCB-D), where you can change calibers by switching out barrels as well.  This Modular Lower Receiver includes the Complete Lower with a B5 Six Position Collapsible Stock with Buffer and Main Spring and Complete Fire Control Group (FCG) and B5 Pistol Grip.  NO Magazine Well.