The Amend2 10 round 6.5 Grendel magazine is a sturdy, reliable AR15/M4/M16 magazine made of advance polymer material. It is a light, durable and excellent alternative to the standard M4/M16 USGI aluminum/steel magazines. This magazine uses a patented internal and follower design to provide lighter weight, easier loading, and greater reliability than any other Grendel magazine on the market. This is accomplished by stagger stacking rounds towards the bottom of the magazine, and filtering them into a single only stack at the feed lips. FeaturesSturdy Impact resistance polymer with textured gripAnti-tilt super followerHeavy duty, non-memory, and non-corrosive stainless steel springMaterial able to cerakoteProprietary Grendel internal design