1968 everything got serial numbers
1986 ban on new manufacture burst of full auto weapons to civilians.
Basically the second amendment, for the purpose it was written, has been utterly destroyed. It still stands for other purposes such as protecting recreational shooters, but as far as ensuring civilians have the tools at their disposal necessary for waging war against the government, it is destroyed.
Maybe we will have a constitutional convention soon and the Second amendment will be repealed or rewritten. As it stands now there are certainly restrictions on the book which our unconstitutional.