MP5K

Not to be confused with the MP5. 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 MP5K 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 MP5K 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, as well as a lugged barrel for attaching muzzle attachments such as a suppressor.

Battlefield 3
In Battlefield 3: Close Quarters, the M5K was first spotted in the trailer for Donya Fortress in Conquest Domination, in the hands of a Russian Assault soldier.

Its ballistic characteristics are similar to the PP-2000, with the same damage and range, but with a much higher rate of fire and increased recoil. Due to these factors, engagements with the M5K should be kept at short ranges. Burst firing can help at long range, but the high damage drop off as well as high horizontal recoil makes this weapon unfavourable for range as it will take up to 9 shots to kill an uninjured foe. The iron sights on the M5K are very clear and sharp, and easy to aquire targets with at the ranges it should be used at. The weapon features Automatic, Semi, and 2-round burst modes. It's worth noting both hipfire and aimed accuracy of the M5K is slightly worse than that of the other PDW's (Not including the AS VAL).

To unlock the M5K players must
 * 1. complete Close Quarters assignment "These Hurt Too" (shows requirements/criteria).
 * 2. complete assignment "Hold the Trigger " (shows requirements/criteria).

Trivia

 * The Battlelog icon lacks the 2 round burst setting.
 * The M5K has a base accuracy 0.6, making it the least accurate primary weapon in the game without attachments that's not a shotgun.
 * The M5K is the only PDW in Battlefield 3 that can unlock both extended magazines and Flash Suppressor as attachments.