Police say the barrels had been removed and the gun was in a nylon case that the student left in a classroom Wednesday. A teacher looked inside, saw the gun and immediately reported it.
There were no injuries or threats.
Spokeswoman Kim Kapp says the teen was arrested for investigation of felony possession of a stolen gun, possessing a dangerous weapon on school grounds and unlawful possession of a firearm.
The prospective buyer was interviewed but not arrested.
Evergreen students were sent to Cascade Middle School as a precaution. The middle school and other schools in the area were locked down.
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