This is the translucent green Lancer L5AWM 30-round magazine for AR-15 rifles. It is chambered for .223 Remington and 5.56NATO.

Lancer’s L5 Advanced Warfighter Magazine (L5AWM) is among the most reliable and tested rifle magazines on the market. Featuring a durable and lightweight polymer body, and robust feedlips, its poly/steel hybrid design is second to none.

The magazine’s color is best described as “translucent OD green”.