There is no one-size-fits-all answer to this question, as the number of magazines you need for your gun will depend on a variety of factors, including the type of gun, the caliber of ammunition it uses, and how many rounds you plan to carry.
However, as a general rule of thumb, you should always have at least two magazines for your gun – one that’s in the gun and another that’s in your pocket or bag. This will allow you to keep shooting even if you run out of ammo in one magazine.
Of course, if you’re planning to use your gun for self-defense, then you’ll need to carry more magazines so that you have enough ammo to protect yourself. For example, many people who carry a concealed handgun will carry at least three or four magazines on their person.
In short, the number of gun magazines you need will depend on your individual needs and preferences. However, it’s always a good idea to have at least two magazines for your gun, just to be safe.