The PANCOR Jackhammer, written as the "Jack Hammer" in Thing-Thing Arena and "Pancor Jackhammer" in Thing-Thing 3, is a weapon featured throughout the Thing-Thing series, as well as the Thing-Thing Arena side-series.
The Pancor Jackhammer is a prototype full-auto shotgun designed by John A. Anderson of the New Mexico-based Pancor Industries in 1984, and was patented three years later. It could fire 12 gauge shotshells at a rate of 240 rounds per minute, making it quite a potent weapon.
While the Jackhammer is a powerful weapon, it's best used at close range, like any other shotgun featured throughout the series.
In Thing-Thing Arena 1, the ammo for the weapon is gun-specific, meaning that you'll have to grab other Jack Hammersfrom the enemies in order to replenish your supply, and it can be scarce at times.
The Pancor Jackhammer is unlocked from getting 40 kills in Super Survival. It uses the same ammo as other shotguns, which means that its ammo is shared with the Striker-12 and Benelli M4. It also has the highest fire rate out of all the shotguns.
The PANCOR Jackhamemr appears again in Thing-Thing 4, using 12-gauge ammo, the same type as the Benelli M4 and USAS-12.
Thing-Thing Arena 3
In Thing-Thing Arena 3, the PANCOR Jackhammer has 20 ammo. The reload time for PANCOR Jackhammer is rather slow, so being patient is key.