This is the CPD Duramag AR-15 .223/5.56 30 Round Aluminum Magazine (10 Pack). 

These lightweight aluminum DURAMAG magazines are as durable as they come. Featuring a 6061-T6 aluminum body with a corrosion-resistant finish, you can rest easy knowing they will withstand extreme training in even the harshest of conditions.

If you prefer to store your magazines loaded “just in case”, the aluminum bodies of these magazines will not flex or swell like some polymer magazines are known to do. Inside the magazine, you’ll find an anti-tilt polymer follower and stainless-steel spring which keep the magazine feeding and running smoothly. 

Regardless if you’re shooting at an air-conditioned indoor range, crawling through the desert sand, or rolling around in the arctic snow, these mags should get you through it! Or, if you simply want to add a splash of color to your rifle, the DURAMAG magazines are offered in almost a dozen different color patterns.

You can never have too many magazines. Why not add a few to the cart just in case?