Thank you for the kind words, but I don't see this as that significant. The Tenko 10-16 adapter should function with any upper that can be used with a M16. Something like a LM-7 that would need to be "tuned" with a specific M16 would need to be "tuned" to the Tenko.
Scott
Manager A&S Conversions L.L.C.
ETA To me the greatest thing about the Tenko adapter is the basic M16 function. That was why my first machinegun was a M16. To push two pins and change caliber, barrel lengths, or just a fresh barrel, means that there is no waiting for a barrel to cool. Is a belt fed system cool? Absolutely, but I don't see very many Tenko owners buying one. But I do think that most Tenko owners will have multiple uppers.