Well I am going to be honest, no. A motion for judgment of acquittal is granted only if the facts viewed in the light most favorable to the state no reasonable person could find you guilty. The question of your knowledge of the drugs is a question of fact for the trier of fact to determine. If you knew of them, you had constructive possession and as the driver of the vehicle trafficking the drugs, you would be a principle in the offense, a principle means your legally responsible for the offense, as opposed to accessory. Unless you have a permit to carry a concealed weapon or firearm, your carrying a concealed firearm is also a question of fact, for the trier of fact to determine, i imagine that it was your gun
since you claim it is legitimately owned, not stolen. You face a possible life sentence
under 775.087 since you possessed the firearm while committing the alleged drug traffficing, and a mandatory minimum of 15 years for the drug offense alone. I would highly recommend you try to make a deal with the state attorney. 400 grams is nearly a pound of cocaine, i doubt you can convince a judge or jury you knew nothing of a person in the back seat carrying over a pound of cocaine. I would stop thinking about motions for acquittal, and start trying to make a deal with the state to get the life sentence off the table, or even to reduce the trafficking charge, maybe they will offer a deal if you agree to testify against the other person. Just my opinion and I am trying to be as honest as I can, it's your case, your life, consult with your attorney.