cost of a $300 pump not to mention another 75-100+ for the 850psi regulated tank, hose and bulk fitting fro the qb. Especially considering its a $130 gun.
$400 will get a lot of co2
Might be better off with a qb79 from MM, and add a HPA tank and pump... I expect would not be much different in price. Too bad don't think I coudl get a qb78 from MM due to being in Canada.