Never said anything about trades. The goal at the moment is to produce a crucial yet restricted component that will bypass all the definitions of a replica. Trademarks could constitute to the definition of a replica and are sometimes more trouble that they are worth.
They may not be as realistic but first off they are legal, secondly, who says the customer/owner cant put a file/grinder to it and "M16ify" it? Don't believe theres a law restricting that.