It depends. All kinds of sears out there of varying quality.
I'm pretty sure 6920s have a blocking bar that would have to be milled out. And if the registered receiver requires the drilling of a sear pin hole than that sear will be married to your receiver. There is no walking it from firearm to firearm because once you drill a sear pin hole you have manufactured a machine gun and ONLY a registered sear keeps it at preban status.
Now if it's a drop in (DIAS) then that's different, doesn't require the receiver to be drilled but I think you still would have to mill out a blocking bar on a 6920 which ATF may consider "modified as a machine gun." You'd be much better off tracking down an older Colt AR-15 which wouldn't need to be modified to accept a DIAS.
But again, lots and lots of variables.
It's hard to be a ACLU hating, philosophically Libertarian, socially liberal, fiscally conservative, scientifically grounded, agnostic, porn admiring gun owner who believes in self determination.
Chuck, we miss ya man.
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