A June 21 court hearing has been scheduled for an Arizona man accused of providing armor-piercing ammunition to the gunman in the deadliest mass shooting in modern U.S. history.

[READ MORE: Mesa ammo dealer talks about interaction with Vegas shooter]

The hearing for Douglas Haig had been scheduled for next week, but was moved to June to provide more time for forensic testing of evidence and consider resolving the case before any indictment is filed.

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[RELATED: Hearing for man accused of providing ammo to Vegas shooter]

Prosecutors charged Haig with conspiring to make and sell armor-piercing ammunition.

Authorities say unfired armor-piercing cartridges found inside the Las Vegas hotel room where Stephen Paddock launched the Oct. 1 attack had Haig's fingerprints.

[READ MORE: Arizona man confirms selling ammo to Las Vegas shooter]

Haig maintains he legally sold tracer ammunition -- which illuminates the path of fired bullets -- to Paddock weeks before the shooting that killed 58 people.

[RELATED: Man, charged after selling ammo to 1 October shooter, receiving death threats]

His charge centers on armor-piercing cartridges.

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