I won't ask which two. But the air is sorta thin at the top, and mostly, it's variations on a theme. Eugene Stoner is dead, John Moses Browning is dead, Kalashnikov is alive, but barely breathing, and probably drunk on cheap vodka, individuals designing firearms to sell to the government is pretty much a dead letter these days.
I'll stand by all I listed as having been owned by me, and enjoyed as accurate technical equipment. Whichever of the two you were thinking about.
/johnny