Running Scared (2006) on Netflix

Joey Gazelle is a low level mob flanker who gets told to dispose of a gun used for killing some dirty cops. Joey however, hides the gun in the drywall of his basement instead of tossing them in the river. When Joey's 10 year-old son and his best friend, Oleg, witness Joey hiding some guns from a botched drug deal, Oleg steals the gun -- a snub-nosed .38 -- and shoots his abusive stepfather with it. Things would be bad enough if the stepfather didn't happen to be the nephew of a psychotic Russian mob boss... who happens to be in business with Joey's crew on a gasoline scam. But now Joey's also got the surviving dirty cop from the botched drug deal on his case... and that hot .38 out there on the street, changing hands in an underworld of freaks, pimps, hookers and pedophiles. As well as Oleg, who can connect Joey to the gun. And even if Joey can make it through the night, he's still got to answer to his wife...