Everything is sold as a set! I will not split this up. This is a King Arms Skeleton receiver cerakoted grey. With it comes the gearbox shell and all the internals that fell out of the gearbox shell as well as a pistol grip and the original HopUp. I used this receiver and gearbox shell combo for a hpa setup for only 1 game this winter. Everything worked fine but I decided I don’t like the look of the receiver. Perfect hpa build for a speedqb guy or something, definitely a cool skeleton receiver, or a fun reassembly project for an AEG tech. I would probably recommend for an hpa engine though lol. On the plus side, this thing weighs almost nothing, especially with an hpa engine. Shipping and fees on me!!