Lil Mosey got caught packing heat.

The 18-year old Seattle rapper's Escalade was pulled over in Burbank last Sunday at 1 AM because it didn't have plates.

Mosey, his driver/bodyguard, and a juvenile were in the vehicle.  Police noticed an empty holster on the driver's lap, and eventually recovered three 9mm pistols. Additionally, cops found four credit cards in the bodyguard's backpack that didn't belong to anyone in the car.

Mosey, the driver, and the juvenile were all charged with felony concealed weapons charges because no one took responsibility for the guns.  Mosey is free on a 35K bond.

Earlier this year, there was a rumor that Mosey got beat down by a Finnish mob will touring in Scandanavia.

We guess he isn't taking any chances in the much-more dangerous LA.