That's a Saiga that has been imported and reconfigured to AK appearance by a company called Arsenal that's out of Las Vegas. They replace an ugly monte carlo stock and all the other furniture, add the pistol grip, re-locate the trigger group to its correct location, add the AK-74 style muzzle brake, and make the gun able to use standard AK mags.
I have one, and it is a very nice AK variant. The one pictured is model SGL-21/61 and has an MSRP of $799.
