I must be dense. I don't understand the question. Doesn't it matter how many guns you have? If you have one gun, eight magazines might be enough. If you have ten guns, eight magazines would not be enough. My lovely and intelligent wife understood very quickly that a $300 gun, carefully bought, was a $500 gun three years later. A $300 dress, carefully bought, is a $10 garage sale item three years later. Money spent carefully on guns, magazines and ammo is an investment. Money spent on clothes and accessories is just "spent".