The gun that killed the cinematographer on the set of Alec Baldwin's Rust had been used for target practice by crew members, sources linked to the western film's production said.
Multiple sources connected to the set of Rust told TMZ that the same Colt pistol that went off in Alec Baldwin's hands, killing Halyna Hutchins and injuring director Joel Souza, had been used recreationally by crew members.
The sources claim that some crew members would go off for target practice using real bullets, and some believe a live round from those practice sessions found its way onto the set.
Another source told TMZ that live ammo and blanks were being stored in the same area on set, offering another possible explanation as to how a bullet was fired from Baldwin's Colt.
Alec Baldwin was wielding a vintage Colt pistol when it accidentally went off. It is not known who loaded the weapon and why it went off as a replacement crew was brought in the day of the incident (The gun pictured above is a vintage Colt pistol manufactured between 1873-92. While the exact model of the gun used is unknown, Rust is set in the 1880s)
The colt pistol accidentally went off and pierced Halyna Hutchin's chest on Thursday
An inconsolable Alec Baldwin is shown outside the Santa Fe County Sheriff's Office after accidentally shooting and killing the cinematographer
Sources on the set of Rust said the incident that killed cinematographer Halyna Hutchins could be tied to the armorer, Hannah Gutierrez-Reed
A search warrant released Friday said that Rust armorer Hannah Gutierrez-Reed, 24, had laid out three prop guns on a cart outside the filming location, and first assistant director Dave Halls grabbed the Colt from the cart and brought it inside to Baldwin, unaware that it was loaded with live rounds.
'Cold gun!' shouted Halls before handing the gun to Baldwin, using the phrase to signal to cast and crew that the gun was safe to fire for the scene, the warrant said.
Seconds later, filming a scene inside an Old West-style church, Baldwin apparently aimed towards the camera and pulled the trigger, accidentally killing Hutchins as she filmed him, and injuring Souza, who stood behind her.
Two production sources who previously worked with Gutierrez-Reed said this was not the first time she was involved in an incident on a movie set.
The two sources told The Daily Beast that Hannah Gutierrez-Reed had allegedly given an 11-year-old actress a gun without checking it properly while on the set of the Nicholas Cage film, The Old Way.
'There were a couple times she was loading the blanks and doing it in a fashion that we thought was unsafe,' one of the sources said.
'She was a bit careless with the guns, waving it around every now and again.'
Hannah Gutierrez-Reed, the 24-year-old head armorer in charge of guns on Alec Baldwin film
A search warrant released Friday said first assistant director Dave Halls grabbed the gun from the cart and brought it inside to Baldwin, unaware that it was loaded with live rounds
An aerial view of the Bonanza Creek Ranch in Santa Fe, where the movie was being filmed. Workers had been protesting over the fact production wouldn't pay for them to stay in hotels and motels in Santa Fe, instead forcing them to drive an hour to Albuquerque
Sources on the Rust set have said the fatal incident that killed Hutchins, 42, and injured Souza, 48, was a result of production failings from top to bottom.
They added that assistant director Halls, who handed the gun to Baldwin and told him it was safe, should have checked the weapon.
'He's supposed to be our last line of defense and he failed us,' one of the sources on set said. 'He's the last person that's supposed to look at that firearm.'
A Rust production source told The Daily Beast that there were at least two previous incidents of guns being accidentally discharged by other crewmember on set before Thursday's tragic incident.
The source described Gutierrez-Reed as 'inexperienced and green.'
Gutierrez-Reed had previously admitted she wasn't sure she was ready for the job on The Old Way in an interview before filming started.
'I almost didn't take the job because I wasn't sure if I was ready, but doing it, it went really smoothly,' Hannah Gutierrez-Reed said in a podcast interview last month after leading the firearms department for The Old Way, starring Nicolas Cage - her first time as head armorer.
Production of the film has stopped now in light of the tragedy. The Santa Fe County Sheriff's Department is investigating and 'collecting evidence', a spokesman said on Friday
She also admitted in the podcast interview she found loading blanks into a gun 'the scariest' thing because she did not know how to do it and had sought help from her father, legendary gunsmith Thell Reed, to get over the fear.
It comes as the film crew revealed they walked off set hours before the fatal accident over safety fears after firearms were accidentally discharged three times - including once by Baldwin's stunt double who had been told the gun was not loaded, and twice in a closed cabin.
Neither Halls nor Gutierrez-Reed immediately returned messages from DailyMail.com late on Friday. Neither has been charged or named as a criminal suspect in the case, though a police investigation is ongoing.
The gun that fired the fatal shot was a vintage-style Colt revolver, DailyMail.com has exclusively learned.
After the shooting, the armorer took possession of the gun and a spent casing, which were turned over to police, along with other prop guns and ammunition used on the set.
Baldwin also changed out of the Western costume he was wearing, which was stained with blood, and turned it over to police.
The warrant does not reveal the model or caliber of the prop gun that fired the fatal bullet, but the film is set in the Old West of the 1880s and DailyMail.com has learned it was a Colt.
The warrant was obtained Friday so that investigators could document the scene at the ranch where the shooting took place.
Unionized workers had walked off the set hours before the fatal shooting, after they complained about long hours, shoddy conditions and another safety incident days earlier involving 'two misfires' of a prop weapon.
A yet-unnamed prop master who oversaw the gun used in the fatal shooting was a non-union worker who was 'just brought in' to replace the workers who left over safety concerns, a source involved in the movie told the New York Post.
It's unclear whether Gutierrez-Reed, the armorer, had recently joined the production, or was one of the crew members who stayed behind after the walk-off.
However, a link in her