According to a declaration -- filed in his nasty custody fight -- Paul claims he has been repeatedly at the receiving end of Adrienne's physical attacks ... the worst of which occurred in July on Maloof's home turf in Las Vegas. Paul says they got into a spat over whether Adrienne's mother could come to a party. Paul says his wife downed 4 vodka sodas -- with a little grapefruit juice -- and became "increasingly hostile."
Paul says Adrienne went on a 45-minute rampage, physically and verbally demeaning him. He says she accused him of cheating and calling him a piece of s**t. Paul says Adrienne screamed he was a horrible dad, and repeatedly beat him in the face, chest and legs.
TMZ previously reported Adrienne filed legal docs claiming Paul has an explosive temper and carries a gun ... sometimes in easy reach of her children. She mentions she took a photo of the gun in the side pocket of his briefcase.
Paul says in his papers Adrienne set him up by taking the gun out of the secure briefcase while he was snoozing and placed it precariously out in the open.