No, you didn't "use the wrong terminology". You blamed something that has been banned in the USA since the 90s (the fully automatic rifle). You are completely ignorant to the difference between a 'fully automatic gun' (banned) and a 'semi-automatic gun' (not banned, and the type of firearm that was used in Nevada and almost every single shooting involving a rifle).
Gun control will lead to and has lead to less law abiding citizens having firearms, and the same amount of criminals (who don't give a shit about your waiting periods or background checks) will have firearms. It does nothing to help the situation, if anything making it worse. So, no, the argument does not "still stand".