Hussein has written and signed many executive orders and congress has not contested even one. I feared he would try to do this by executive order and Biden says he will and Holder is working on this. I think congress will not contest gun control executive orders as this way gives them cover not to have to deal with it.
You are correct. Congress has not responded to these unconstitutional EOs, e.g., the backdoor amnesty that will legalize the status of 1.8 million illegal aliens.