Yes he could set aside the jury verdict if it came back with guilty. I don't think guilty verdict is going to happen. At best, for the prosecution, would be a hung jury. In that case he could dismiss the throw out the charges.
My guess if the judge will throw out the gun charge and let the rest go to the jury. I think there is a very good chance of a not guilty verdict and if there isn't then the judge will dismiss with prejudice.