OK, I'll take up that bet comparing an AK late-mdel FH to a FN for weight.
Demonstrably "one of the most effective", not better was my statement I think. Good challenge though. I've seen a lot of commercial FH and MB combos come down the road in the FAL wastelands (I moderated The FAL Files for years), and the 22mm Combo was always in the running. Sometimes better, sometimes not the best, but not down there with some of the trash you see done without any science. The ports are venturi, PV=nRT is still a rule in physics, and the crazy things work. Instead of breaking up the flame front, they actually quench it using physics. As we say around here, IFLS (I F-N live science).
So, I'll go weigh the darn things- I think I have a scale that goes that light. Meanwhile, bulk up on your forearms 'heavyduty' if you can't push a pipsqueak FH/MB combo around on plates. Start with Spinach?