Stubby ICS shell and gearboxes. Comes with everything in picture *no hop up/works with all HopUps with modification or pro win and ICS direct drop* missing the mock bolt release, and spring for the "gearbox latch" (neither affect functionality) and doesn't have mounting hardware for the stock adapter or buffer tube(sits firmly on adapter without). Upper and rail section are extremely difficult to separate. It was my brothers and I don't know if we F***ed up or not.