Kwa qrf mod 1 shell only this gun had a polarstar kythera, I only bought this for the engine, so what you see is what you get, can include the inner barrel but hop unit is broken, this would be a good build for a hpa system ie: wolverine inferno, polarstar jack etc, so anything with an fcu and trigger board, it's got the kwa gearbox that's been modified  to take a hpa engine and the lower has been modified to take a cnc hop unit, if you're going to use a different hop unit other than the standard kwa you will have to take 2mm of the feed tube, so that the mag cach works, and yes the mags are include 4x 80 rnd £100 that includes PayPal and post