Pack For The Fight. SureFire’s high-capacity magazines for 5.56x45 mm (.223 Remington) ammunition offer critical advantages in any firefight: shoot more; reload less. Compatible with M4/M16/AR-15 variants and other firearms that accept standard STANAG 4179 magazines, they increase initial firepower in ambush situations. Fewer reloads overall mean less downtime and target distraction. Magazine insertion is fast and easy, even with a closed bolt, and they’re less bulky compared to drum mags, enabling a normal weapon grip. The 60-round magazine is thinner than two 30-round magazines clipped together and about the same overall length. It fits in most dual magazine pouches, eliminating special carry pouches required for drum magazines. Twice the violence of action. Half the reloads. Win-win.