is that it would give a Federal Bureaucracy (probably ATF) the discretion to define this nebulous term in any way it desires without Congressional approval. Just as the EPA has taken upon itself the power to regulate CO2 emissions, the ATF could decide at some later date that anything other than single shot rifles are "assault weapons" which can be regulated by them. I am not a gun nut or NRA member, but I am aware that 90% of federal law is in regulations rather than in legislative statutes. Giving discretionary authority to governmental agencies is almost never a good idea.