This is the Lancer L7AWM AR-10 .308/7.62×51 5-round magazine. 

Why settle for polymer or steel, when you can have a hybrid Lancer L7AWM magazine that incorporates both?!

Lancer magazines combine a lightweight polymer body with hardened steel feed lips to deliver superior durability and reliability. The magazine includes an anti-tilt polymer follower and a stainless steel spring, allowing you to keep it fully loaded and ready to perform flawlessly at any moment. 

A switchable drain lock in the floor plate can be used if shooting in wet conditions, proving that Lancer has thought of nearly everything! Whether you’re hunting, competing, or protecting your land, these Lancer L7AWMs are up to the task!

Grab a couple to make up for the fact they are only five rounds a piece!