LOS ANGELES — The semiautomatic rifle used by a convicted felon in a gunbattle with police off the 215 Freeway in Riverside on Monday, killing California Highway Patrol Officer Andre Moye and wounding two of his colleagues, was a “ghost gun” that cannot be traced by authorities, according to law enforcement sources.

Investigators have publicly described the gun used in the gunbattle only as a rifle, but a law enforcement source with knowledge of the investigation told the Los Angeles Times that Aaron Luther used an “AR-15-style rifle.” The sources spoke on condition of anonymity in order to discuss the case candidly.

Ghost guns are unserialized weapons that are manufactured from parts that can be ordered through the mail or machined parts acquired from underground makers.

The Bureau of Alcohol, Tobacco, Firearms and Explosives has been unable to trace the weapon used by Luther, two law enforcement sources with knowledge of the investigation said.

Luther, a convicted felon with an extensive criminal background, would not have been allowed to possess a firearm under California law because of his criminal record.

Authorities are seeing a proliferation of such untraceable weapons.

“About a third of all firearms seized in Southern California now are unserialized and that is expected to grow,” said Ginger Colbrun, a spokeswoman for the Los Angeles region ATF office.

Those with lengthy criminal histories, according to law enforcement officials, usually buy their weapons on the black market of underground weapons sales. In one raid last year, authorities recovered 45 ghost guns after a six-month undercover operation in Hollywood. In that case, some of the weapons made by a gang were assault weapons.

An AR-15 like the one possessed by Luther shoots small but high-velocity bullets and can be modified to use large-capacity magazines. The .223-caliber rounds often shatter inside victims’ bodies, creating more devastating injuries than wounds typically left by larger but lower-velocity handgun rounds.

A source familiar with the weapon recovered from Luther after he was killed said the magazine was likely a 30-shot magazine and that he was able to fire a large number of rounds before Riverside police and sheriff’s deputies joined the gunbattle and cut him down.

Investigators are still trying to determine how Luther came to possess the weapon.

Court records show Luther pleaded guilty to one count of attempted murder and two counts of burglary in Los Angeles County in 1994. He was sentenced to 12 years in prison and granted parole in 2004, according to the California Department of Corrections and Rehabilitation.

The Beaumont resident also had been convicted of disturbing the peace, vandalism, battery, stalking, unlawful possession of a firearm, assault with a deadly weapon and corporal injury on a spouse in the past, officials said.

Riverside Police Chief Sergio Diaz said the gunbattle that ultimately killed Moye, 34, was “long and horrific,” leaving investigators with multiple crime scenes to examine. Moye, who had been with the CHP for almost three years, was airlifted to a hospital in Moreno Valley after the shootout, where he was pronounced dead. The two other CHP officers wounded in the shootout are expected to recover, said Inland Division Chief Bill Dance.

The deadly encounter began at 5:35 p.m. when Moye stopped Luther, who was driving a white GMC pickup, at the Eastridge Avenue/Eucalyptus Avenue off-ramp. At some point during the traffic stop — for reasons not yet known — Moye decided to impound the man’s vehicle and called for a tow truck, said CHP Inland Division Assistant Chief Scott Parker.

It was not immediately clear where Luther was heading when he was stopped. While Moye was filling out paperwork, the man got a rifle from his truck and started shooting at the officer, Parker said.

“We don’t know why” the shooting began, Riverside police spokesman Ryan Railsback said. “That is all going to be part of this lengthy investigation.”

Moye returned fire, and even though he had been shot, he was able to radio for help. Three other CHP officers soon arrived, followed by three deputies from the Riverside County Sheriff’s Department and at least one officer from the Riverside Police Department, authorities said.

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