This round is going in the M249 SAW replacement. It's not being touted as a replacement for 5.56 in a standard rifle. They tried replacing the 5.56 with the 6.8 SPC years ago. I worked with a former SEAL who was on the teams that tested the 6.8. His response was "meh". They found no advantage to it over 5.56. Good hits were good hits and bad hits were still bad hits. I do think a cartridge with more mass than 5.56 and less recoil than 7.62 would be a good SAW round. I was a SAW gunner for a while and I think a little bit better penetration would be a good trade off.