tc617
USN Sub Vet
I'm wonder if the issue here is that the receivers were initially built to a level greater than 80% (thus illegal) and then "filled" with a different color plastic. This may also be the reason why ARES is not objecting to having the receivers seized.
That's one way, but there could be another way to make that 80% receiver...
Cast the colored trigger pocket first, then insert it into a mold to pour the outside receiver color around it.