MP5K

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Not to be confused with the MP5.

The MP5K in real life, with a 15-round magazine.

The M5K, in reality known as the MP5K (German: Maschinenpistole 5 Kurz, English: Machine Pistol Model 5 Short) is a variant of the German MP5 developed in the 1980's, and both weapons are produced by Heckler & Koch. The M5K fires the same 9x19 Parabellum round from the original MP5 from either 15 or 30-round magazines.

This variant was developed for counter-terrorist and law enforcement agencies that needed a large amount of firepower in a compact package. Compared to the original, the MP5K has a shorter range and penetration but is much more maneuverable to handle over the MP5 due to its smaller size. A variant of the MP5K, called the M5K PDW, was developed in the 1990's as a replacement of military sidearms for soldiers and differs by having an attached folding stock on the rear of the weapon.

Battlefield 3: Close Quarters

M5K
Kit	All Kits
Inventory slot	Primary weapon
Progression
Unlocked at	Complete assignment hold the trigger
Unlocks	Reflex (10 kills) Laser Sight (20 kills) Suppressor (30 kills) Holographic (40 kills) Tactical Light (50 kills) Extended Mags (60 kills) M145 MGO (70 kills) ACOG (80 kills) Kobra (90 kills) Flash suppressor (100 kills) IRNV (125 kills) PKA-S (150 kills) PK-A (175 kills)
Dogtag(s)	Proficiency Mastery
Handling
Firemodes	Automatic
Rate of fire	900 Rounds per minute
Ammunition
Magazine	20+1 rounds 30+1 rounds with Extended Magazine
Starting ammunition	105+21 rounds
Maximum ammunition	168+21 rounds
Range and Recoil
Recoil	Low

"A tactical machine pistol based on one of the world’s most successful submachine gun designs. With the shoulder stock completely removed and the shortened receiver, this ultra compact personal defense weapon is capable of very high rates of fire, as well as great stopping power at close range. "

— Battlelog description

In Battlefield 3: Close Quarters, the M5K was spotted in the trailer for Donya Fortress in Conquest Domination, in the hands of a Russian Assault soldier. The weapon is seen with a 20-round magazine, a Red Dot Sight, a Suppressor, and a Laser Sight.

Its ballistic characteristics are similar to the PP-2000, doing similar damage but with a higher rate of fire and increased recoil. Due to these factors, engagements with the M5K should be kept at very short ranges. Burst firing can help at medium range, but the high damage drop off makes this weapon unfavourable as it will take up to 10 shots to kill an uninjured foe. The iron sights on the M5K are very clear and easy to aquire targets with at the ranges it should be used at.

To unlock the M5K players must complete the "Hold the Trigger" assignment. The requirements for this assignment are:

• Finish top five in Gun Master (once)
• 100 Kills with Submachine Guns

The MP5K, being used by a Russian Assault soldier before being killed in the Donya Fortress Domination Trailer.

A better look. note no mag when dropped

M5K First Person View

M5K Iron Sight