Hydra Weaponry, Maine’s top gunmaker and the brains behind the MARCK-15 Hydra® Weapon System knows how to cater to the Glock crowd. Their latest creation? A modular rifle built around the .45 ACP, the second most popular caliber in civilian, law enforcement, and military circles (right behind 9mm). Enter the Hydra MARCK-15 H21 Modular Rifle—a […] Source