The MP5 is a sub machine gun available in every map except for Origins in Call of Duty: Black Ops II. Its other variant, the MP5K, is obtainable throughout Call of Duty: Black Ops zombies; both weapons share the same stats, except for recoil, and price. The MP5 also shares the same Pack-a-Punch name as the MP5, 'MP115 Kollider'. The weapon costs 1000 points to be bought off the wall and its ammo can be bought for 500 points.
When Pack-A-Punched, it becomes the MP115 Kollider. It adds more damage, and more ammo. It can not be Pack-a-Punched more than once, but ammo can be purchased off of the wall on all maps where it is available, making a semi-effective weapon to hold onto even in the high rounds.