The UN has standards???Do any AR's shoot UN standard or AK 7.62x39 rounds?
You forgot:Let me see if I can remember them all..
On a standard 5.56 lower, with an upper change you can get:
.50 Beowolf
450 Bushmaster (just released)
6.5 Grendel (awesome long range round0
6.8 SPC (mentioned above)
7.62x39
9mm
.45ACP
.300 Whisper
That should be close to most of them.
I think he meant NATO. The the UN has no standards whatsoever.The UN has standards???