Optimize the performance of your 6.8 SPC chambered AR with durable, high-strength steel magazines. The hardened steel construction, featuring tempered feed lips, ensures structural integrity and prevents flexing, bending or deformation. The tempered steel springs are designed to maintain consistent feeding and functionality, even with the heavier 6.8 SPC cartridge. The lightweight Magpul nylon composite followers are clearly marked with 6.8 SPC to prevent confusion with magazines for other calibers. Additionally, these magazines are compatible with .224 Valkyrie and .22 Nosler cartridges.