Ok i bought my 80% flat reciever with a 6 part us compliance kit and the guy wants to know these things....

Do you want predrilled trunion holes on your flat?

Do you want a double hook or single hook trigger ( the
flats are cut for double hook)


Whats it mean and what should i tell him?

whats it mean that the flats are cut for double hook? is their a diff? i'm confused....
need a reply asap.... i bought the romanian kit that looks like this