I3BrigPvSk
The Viking
Ruger released the SR-556 and Mini-14 in 6.8SPC but the cartridge is dead. SF units aren't even playing with it anymore. The two non-5.56x45mm cartridges are the 6.5 Grendal and the .300BLK. But even them those are two very small niche cartridges.
5.56x45mm is doing well and is here to stay.
Is it dead? But it is available on the civilian market?