It's difficult to take that article with more than a grain of salt when there's clear political bias and a lack of proper sourcing from the start. Of course political bias is inevitable, but to claim that our gun laws are the result of a takeover by "a minority of radical extermists" is ridiculous.

Then when referencing hard numbers and talking about the influence the NRA may have had, she doesn't back that up with anything. Her "notes" are mostly other highly opinionated articles. Had she followed any form of standard or proper notation[1] it'd be easier to believe her. But usually when people fail to make their sources easily available it's because they don't have them/they are low quality.

[https://en.m.wikipedia.org/wiki/Wikipedia:Citing_sources]

Edit:

Just to add another comment to this. Typically when someone claims that something which is supported by a large percentage or even the majority of a given population is the result of "extremism", they themselves are like the extremists, for better or for worse.