Pack-a-Punch Machine

The Pack-a-Punch Machine is a new in-game utility for the zombie map Der Riese. This utility is much like the mystery box or the Perk-a-Cola machines. The Pack-a-Punch machine allows upgrades to the majority of the weapons found in the zombie level. The Pack-a-Punch machine also changes the names of weapons and doesn't always make your weapon stronger. For example the Ray Gun is changed to Porter's X2 Ray Gun and will not get stronger but instead shoot out red rays, increase magazine and reduce the splash damage of the weapon (that way it won't harm you as much when shooting close distance zombies or dogs). The nature of the upgrades on guns is not known when being upgraded, but the Pack-a-Punch also puts elaborate engravings on them. The Pack-A-Punch Machine requires the power to be on, all 3 teleporters to be linked to the mainframe, a compatible gun and 5000 points.

Table of Effects on Weapons
NOTE: All weapons receive a high power boost when upgraded

Trivia

 * Above the Pack-a-Punch Machine there are two pictures of a Ray Gun, one with a 'bent' barrel and the other 'erect'.
 * When a weapon is upgraded by the Pack-a-Punch Machine, only the metalic parts and the magazine are engraved with the markings. This is easily seen on the M1 Carbine and the G43

Source
The names of all the weapons available, and their names afterward, for the Pack-a-Punch machine can be found on this section of the World at War official website.

Effects are determined through playtesting.

Check out this video to see most of the Pack-a-Punch weapons in action.