Upgraded weapons

The following is a list of the Pack-a-Punch weapons and the differences between them and the normal versions of the weapon.

Wunderwaffe DG-2 vs Wunderwaffe DG-3 JZ

 * Cannot be upgraded if received from a Lightning Bolt.

Trivia

 * Some Pack-a-Punch weapons have the number 115 in their name, a reference to Ununpentium, also known as Element 115, which was related to the creation of the zombies, teleporters and the Wonder Weapons. Also, if one goes to the monitor (after breaking out of the chair at the main menu), one can access a document by Dr. Maxis saying that element 115 can enhance weaponry.
 * A few Pack-a-Punch weapons have numbers that stand for letters, a reference to "leet-speak", a symbolic alphabet that uses a combination of ASCII characters to stand for letters (5 = S, 3 = E, |-| = H, etc.). For example, a Pack-a-Punched AUG is the AUG-50M3, which can be translated as AUG-SOME, which is similar to "awesome".
 * Weapons from World at War have a certain Pack-a-Punch camouflage scheme, while the weapons from Black Ops have a different camo scheme. In World at War, the camo is a metallic tone, while in Black Ops, the camo is more of a machinery tone with (what looks like) circuitry covering it.
 * In Der Riese, it is possible to Pack-a-Punch a Mosin-Nagant, a Sawed-Off Double-Barreled Shotgun w/ Grip (The Snuff Box) and a Arisaka (The Eviscerator) through modding (which were cut from the final game).
 * Mustang and Sally is a reference to the song Mustang Sally. On the front of the game's box, the soldier is holding an M1911 named "SALLY".
 * The Typhoid and Mary is an obvious reference to the actual person Typhoid Mary.
 * The Tokyo and Rose are likely a reference to the actual people nicknamed Tokyo Rose.
 * The Calamity and Jane are likely a reference to the actual person Calamity Jane.
 * When upgraded, the Ray Gun's third person model does not change.
 * The FN FAL's Pack-a-Punched version, the EPC WN, is a pun on the name meaning "epic win" as the FN FAL's name can be parodied in to "fucking fail".