Rick, would it be possible you could ask the lab for clarification before anyone goes down such a road as making an upgrade to the trigger (specifically without any alteration to reciever dimensions). It seems to me you were looking at sourcing Trigger Tech triggers at one point, so surely the manufacturers name being specifically noted in the FRT cant be that big of a deal other than it being a way of noting the single pin drop in trigger design was the only factory option offered.
If parts are made to fit the gun, and not the other way around.... then it's no different than the barrel issue where folks must adapt barrels to fit rather than notching their recievers to accept standard barrels.
Let me ask you this: is the 6 o'clock indexing pin mentioned in the FRT? If so, how is it a different issue from the trigger? Both are mentioned, we are allowed to alter barrels to fit legally, but not allowed to alter triggers to fit legally?
Both would have zero dimensional changes to the reciever, and are both specifically noted in the FRT as design characteristics if I am not mistaken, and both are based off of basic AR part that (like the BCG) have been specially modified or incorporated into the Modern series design.
I really (as you know)
have a hard time believing this (making a new trigger single pin drop in housing that reqiures no reciever alterations, but would require alterations to the width of the implant trigger//<--definite liability issues there from a manufacturer perspective, and certainly would void warranty on the implant trigger)
is any different than altering a non-manufacturer offered barrel or BCG to fit.
Muzzleing the aftermarket manufactures from innovation is a real shame. The Modern series is a really unique platform with strong potential, but I feel the aftermarket could improve it more starting with 2 pin to single pin trigger housings, and possibly even a lower pofile charging handle. (Although the new spring assisted Charging handle appears to be a great design improvement, just wish it stuck out less)
/rant