We designed our SIX8 family of weapons around a reliable magazine, previously a drawback of using the 6.8 Cartridge in M4 style weapons. The SIX8 features the first polymer 6.8 magazine. The SIX8 PMAG features many of the same design characteristics as the standard PMAG, including the curved shape and familiar texture. The body is slightly wider, and the walls were strengthened in critical areas. Our red follower makes the SIX8 magazine easy to pick out of a pile. The upper and lower receivers are designed to accommodate the slightly larger polymer magazine and to perfect the feed geometry for the 6.8 cartridges. As with the IC family, the weapons in the SIX8 family are fully ambidextrous. The 6.8X43MM SPC II cartridge was developed as a part of the Enhanced Rifle Cartridge Program to address the deficiencies in terminal performance seen with the 5.56x45mm NATO cartridge while allowing the soldier to carry the same number of rounds with a minimal weight penalty. By using a heavier projectile, the 6.8 round offers more impact energy than the 5.56 NATO round across all effective ranges, effectively bridging the gap in lethality between 5.56 NATO and 7.62 NATO.