Comes with inner and outer barrel + Hopup assembly. All it needs is a gearbox, motor, battery, and stock. NOW COMES WITH STOCK (not pictured, will update pics soon) Set up perfectly to drop in an HPA engine. Charging handle doesn’t work. Can include 2x 9.6v batteries in 3D printed battery boxes for an additional $20. Tape is for pics only since there is no gearbox installed to hold the grip or mag release. 3rd pic is for reference of what it looks like with HPA installed. $70 shipped.