According to investigators, the 34-year-old victim pulled over along 31st Street and 35th Avenue at 5:20 a.m. to close his trunk.
Four men exited a grey Dodge Durango SUV and approached the man.
Police say they displayed a firearm and told the victim to hand over his stuff and drop his keys.
Two suspects jumped into the Rolls-Royce, while the other two jumped back into the Durango, all fleeing from the scene.
The carjackers also fled with the victim's registered firearm, cellphone, watch, and a jacket.
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