Smokin' Double Barrels

"It’s time to lock and load because it's Smokin' Double Barrels! The Weapons Depot Building Event starts out with a bang when The Godfather provides you with a shipment containing enough construction parts to upgrade your Weapons Depot one level. Craft two exclusive weapons called The Predator Minigun and The Lock and Stock. They can only be built for a limited time and require special Gun Barrel parts. Work with your mafia by sending Gun Barrels to each other.  You'll be able to make twice as many because the Weapons Depot crafting timer will be reduced from 24 hours to 12 hours. 3 additional weapons requiring Special Parts have been permanently added to The Weapons Depot. The event only lasts for 6 days so step it up and get crafting!"

- Mafia Wars Blog