This isn't the greatest idea. First off, it needs to be FULLY enclosed in a case made for a gun. Second, any officer can argue that anywhere in the passenger compartment is accessible and in reach, which it is. Center console, glovebox, back seat, on your hip when in the car is all considered having a "concealed" weapon.
Gun and mag separate, in a case, in the trunk, unloaded. You must take the case completely out of the car, not rest it on the car, not in the car at all, not placed on the closed trunk, remove the gun from the case, holster it immediately.
I was asked to leave Home Depot today because my gun was making people uneasy and nervous. I was not allowed to make my purchase first and leave either. The store is going to get a nasty letter from me.
Carried in Best Buy and Menards in Racine. No issues. Gladly bought all my items from Menards and said "eff you" to Home Depot.