[wastedyears]

The 5.56 and 7.62 are standardized by NATO, so that if somebody is low on ammunition, an ally can replenish some of their stock while the country low on ammo waits for their own shipments.

At least that’s what I’ve read here on FR.

:)

[n230099]

I believe that's correct. I was noting it because the piece seemed to imply that the M-14 was such an "imposing weapon built for wars long past, spits out bullets larger and more deadly", that it was some bizarre extra lethal contraption when, in fact, is was a standard weapon.