Staff Writer (Updated: 10/1/2013):
At its core, the Jackhammer was a conventional gas-operated system which allowed for full-automatic fire from a revolving 10-round ammo-cassette feeding 12-gauge (2.75") shells in through the rear of the receiver. The weapon sported conventional iron sites and two integral loops to serve as carrying handles across the top of the receiver. The barrel featured a distinctly angled muzzle cap with the angled pistol grip integrated into the underside of the weapon body. The Jackhammer weighed 4.57 kilograms with an overall length of 787mm and barrel length of 525mm. The firing action was semi-automatic or full-automatic through a selector switch. Rate-of-fire was listed at an impressive 240 rounds per minute. Due it its high rate-of-fire, the National Firearms Act of 1934 in the United States categorized the Jackhammer as a "machine gun" due to its high quantity repeat-fire capabilities, subsequently resulting in heavy regulation.