Tripwire Interactive has just released the free Heavy Metal Content Pack for the hit co-op survival horror title, Killing Floor AND is throwing in a 10% discount on the game for the week. Following on from the success of the earlier DLC Character Pack, this entirely free update brings 2 new weapons, a brand new map and a bunch of other new features to the game. The major ones:

• 2 new weapons: the AK-47 assault rifle beefs up the Commando Perk, with heavier hitting power in semi and full automatic fire modes. The Katana is a classic melee weapon that combines speed, reach and cutting power.
  
• A brand new map: KF-Foundry. This map is set in a Horzine manufacturing facility, tucked away in an old steel foundry. Multiple levels, strange machinery and molten metal all serve to create an eerie and frantic location to fight off the specimen hordes!
  

Click here for the full change list

The pack is free to everyone who owns the game and will update automatically.