New Mexico prosecutors plan to recharge Alec Baldwin with involuntary manslaughter over a fatal on-set shooting in October 2021.
The prosecutors dismissed charges against the Emmy award-winning actor in April, just two weeks before his trial was due to start.
But "additional facts" merit bringing the case again before a grand jury next month, they said.
Real guns firing blanks are used in higher budget Hollywood films because it looks more realistic. Many TV shows will use gas blowback airsoft pistols and add muzzle flash in post production but you can tell because there are never spent casings being ejected.