It's easy - as you said, "low hanging fruit". The most obvious being restrictions on high capacity magazines, bump stocks and the like. There is precedent in regulating "machine guns" (now overturned) and even political will - if you believe the polls. OTOH, there are the extremely large contributions to electoral funds of pols that "cooperate" with the gun lobby arms dealers. Or, considering the political turn of the last few years: "Oh my, nothing can be done..."