This is the Promag Ruger Mini-14 42-round polymer magazine in .223 Remington and 5.56x45mm NATO.

Although most other Mini-14 magazines are heavy steel or aluminum, this Promag magazine offers a lightweight and durable solution – polymer.

With an anti-tilt polymer follower, steel wire spring, and polymer baseplate, it’s easy to say that this Promag magazine won’t let you down.