The 19-year-old was sitting in a Commodore with his mates outside the IGA supermarket in Pitt Town in Sydney’s northwest on Friday night when he shot himself.

“We are aware a 19-year-old male received a serious gunshot wound to the head after reports he was involved playing Russian roulette with a loaded revolver,” Detective Inspector Garry Sims told AAP.

The Smith & Wesson firearm discharged in the side of Mr Taylor’s head above his ear.

He was rushed to Westmead Hospital where he remains in a critical but stable condition.

Det Insp Sims said Mr Taylor’s family were devastated"