Cameron Calvisi was at the Cottonvale property, near Stanthorpe just north of the Queensland-New South Wales border, about 4.30pm on January 2, when a .22 rifle was unintentionally discharged and the bullet lodged in the jaw of the young boy.

He was airlifted to Lady Cilento Children’s Hospital in a critical condition, placed in an induced coma and underwent emergency surgery to remove the bullet from his face.

The five-year-old boy was reportedly released from hospital at the end of last month.

On Monday evening, police announced the boy's 29-year-old father, Robert Calvisi, had been charged with one count of unlawful possession of a weapon and his 63-year-old grandfather, Tony Calvisi, had been charged with one count of failing to secure a weapon.

Tony Calvisi had spoken of his anguish at the shooting, saying he had been out hunting pests on the family's 20-hectare Cottonvale hobby farm and left his gun in his ute instead of putting it away properly.

It took “only a few minutes” for Cameron's 12-year-old to get hold of what Mr Calvisi maintained was an unloaded firearm.

“He played with something he shouldn’t have played with,” he said, of the "tragic accident.

“They were in the old main shed. The gun was stored in an area where he shouldn’t have touched it.

“He’s old enough and been told never to touch anything but I don’t know why he even went there.”

Tony said he usually kept the gun in a safe but a storm sent him inside the shed.

Both men are due to appear in the Warwick Magistrates Court on March 28.