Tripwire Interactive has confirmed that they are releasing the free Heavy Metal Content Pack for their co-op survival horror title, Killing Floor AND 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 weapons and map include the AK-47 assault rifle which beefs up the Commando Perk, and The Katana which combines speed, reach and cutting power.

The new map is called, KF-Foundryand 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.