POST, Texas (CBSDFW.COM) – A suspected neo-Nazi was charged with a gun crime following an investigation by the FBI.

Aiden Bruce-Umbaugh, 23, was charged with possession of a firearm by an unlawful user of a controlled substance after he was arrested in Post, Texas, dressed in tactical gear and in possession of multiple firearms.

Aiden Bruce-Umbaugh, 23 (credit: Lubbock County Detention Center)

A federal grand jury indicted Bruce-Umbaugh Wednesday.

According to a criminal complaint filed a week prior, local law enforcement executed a traffic stop for a blue Ford Focus on Nov. 4. The vehicle was driven by Kaleb Cole; Bruce-Umbaugh was seated in the front passenger seat.

Inside the vehicle, law enforcement allegedly discovered an AR-15 rifle, two AK-47 rifles, a Sig Sauer 9mm pistol, at least 1,500 rounds of ammunition, a small canister of marijuana, and approximately two grams of THC oil.

Bruce-Umbaugh – who “avoided eye contact and limited conversation” with law enforcement and denied having anything illegal inside the vehicle during the traffic stop– later admitted that the firearms, marijuana, and THC belonged to him, telling investigators he smoked marijuana on a daily basis, according to the complaint.

“Federal prosecutors are committed to enforcing our nation’s gun laws to keep communities safe,” said U.S. Attorney Nealy Cox. “As a drug user, this defendant should never have been allowed to possess firearms.”

“The large amount of weapons and ammunition seized from the defendant is alarming and we understand there is a cause for concern,” said FBI Special Agent in Charge Matthew J. DeSarno of the Dallas Field Office. “The FBI works with our law enforcement partners daily to protect our communities from harm. We want to reassure the public that swift action was taken to remove weapons from a dangerous individual.”

In a detention hearing Wednesday, prosecutors argued the government had reason to believe Bruce-Umbaugh is a member of AtomWaffen Division, a neo-Nazi hate group.

In jailhouse phone calls, Bruce-Umbaugh allegedly referenced his affiliation with “the group” and discussed a photo taken of him and another AtomWaffen Division member at the Auschwitz concentration camp, prosecutors said at the detention hearing.

Propaganda videos admitted into evidence – which spew hateful rhetoric against Jews – depict members of the AtomWaffen Division at self-described “hate camps” practicing hand-to-hand combat and shooting firearms.

If convicted, Bruce-Umbaugh faces a sentence of up to 10 years in federal prison.