Just a word of warning, I bought a PM7 for around the same price, told all that needed doing was some wires needed repairing, long story short and £40 servicing later it needs a new solenoid for an extra £60 even though the solenoid "clicks" like the seller said
Just watch out for those kind of things if buying cheap, and make sure the seller has tested the marker and confirms it shoots!
Back on subject, hopper and bottle shouldn't be too hard, I've just sold mine but what is your friend looking for, a cf tank or a steely?