This is a ProMag® 10-round magazine for AR-15 rifles in 5.56mm/.223 Rem.
These 10-round polymer ProMag magazines are the perfect choice for target practice, prone shooting, and bench rest shooting due to their compact size. Built from lightweight polymer with heat-treated chrome silicon internal springs, these enhanced magazines come with ProMag’s lifetime guarantee. That means if you ever have any issues at all, you can send the magazine back to ProMag and receive a free replacement. Providing the ultimate in flexibility, customizability, and reliability, the AR-15 platform is a perfect addition to any shooter’s arsenal. Customize and modify your rifle to your heart’s content—and ProMag magazines are there to keep it all running smoothly.