What I am reading implies that perhaps I need more than a single spell, not that it cannot be done. You do not even have to pull the trigger (e.g. Trigger removal). So you need to point the darn thing in the right direction according to the SmartLink camera. If you cannot extend the magic hands enough from one another just use two independent spells to hold the gun.
There are a couple of spells that could be used in combination, yes. (Jack lists one).
Keep in mind some things here:
Cyberware for a pixie is a total GM call. They are not "metahuman" and the fact that they vanish on death means there has been no study of their nervious system, cardio system, or any other in depth study of their physiology (which makes cyber ware designed for a metahuman system - at 4 times the mass! A 'little tricky' to implant).
For each spell you sustain, you recieve a -2 dice pool to all other actions - like shooting. So maintaining 2 to 3 spells is a -4 to -6 dice to shoot.
There are ways to overcome the DP hit, but those require both karma and money.....
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Really, the action and resource economy needed for a pixie to shoot a gun is just too high when there are other better options available for cheaper costs...