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. Pack-a-Punching costs 5000 points to purchase and makes ammo cost 4500 points (wall-bought weapons only). A clear difference compared to the standard gun is the special camoflauge and a different firing sound. Pack-a-Punched weapons are always significantly more powerful than their un-upgraded counterparts and for most guns, fire at a slightly higher rate too.

Call of Duty: Black Ops
For a chart depicting the stats of each weapon before and after it has been Pack-a-Punched, click here.

Wunderwaffe DG-2 vs Wunderwaffe DG-3 JZ

 * Cannot be upgraded if received from a Lightning Bolt.

Trivia

 * When the texture is laid out completely flat, the World at War's Pack-a-Punch texture has satanic symbols on it.
 * 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 an 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 that has the word "SALLY" and the number eight in tally marks carved in the side.
 * 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.
 * Just like the Ray Gun, the Mustang and Sally pushes the user back when fired.
 * The M1911 (Mustang and Sally) are the only weapons that can be pack a punched before round 1 even starts on Moon.