The Mag Ring. Magnetic ammunition ring for steel balls. The design: The Mag Ring impresses with its minimalist, robust design. The ammo ring is made of high quality, durable magnet capable of withstanding the toughest conditions. It is adjustable in size. The Mag Ring allows you to access your ammunition in a flash, so you can focus on what really matters: Your target. Size and fit: With its adjustable size, the Mag Ring fits on any finger and can be used by both right- and left-handed shooters. Its compact size makes it a must-have companion that fits seamlessly into your existing gear.